diff --git a/briar-android/build.gradle b/briar-android/build.gradle
index ef67411453b17e40db2f911018031603ef582bea..a0f141b51d9e519ab679b915620cb96ca03b94fa 100644
--- a/briar-android/build.gradle
+++ b/briar-android/build.gradle
@@ -112,7 +112,6 @@ dependencies {
 	implementation 'androidx.recyclerview:recyclerview-selection:1.1.0'
 
 	implementation 'info.guardianproject.panic:panic:1.0'
-	implementation 'info.guardianproject.trustedintents:trustedintents:0.2'
 	implementation 'de.hdodenhof:circleimageview:3.1.0'
 	implementation 'com.google.zxing:core:3.3.3'  // newer version need minSdk 24
 	implementation 'uk.co.samuelwall:material-tap-target-prompt:3.3.0'
@@ -157,8 +156,8 @@ dependencies {
 	androidTestAnnotationProcessor "com.google.dagger:dagger-compiler:$dagger_version"
 	androidTestCompileOnly 'javax.annotation:jsr250-api:1.0'
 	androidTestImplementation "junit:junit:$junit_version"
-	androidTestScreenshotImplementation 'tools.fastlane:screengrab:2.0.0'
-	androidTestScreenshotImplementation 'com.jraska:falcon:2.1.1'
+	androidTestScreenshotImplementation 'tools.fastlane:screengrab:2.1.1'
+	androidTestScreenshotImplementation 'com.jraska:falcon:2.2.0'
 	androidTestScreenshotImplementation 'androidx.test.uiautomator:uiautomator:2.2.0'
 }
 
diff --git a/briar-android/src/main/java/info/guardianproject/GuardianProjectRSA4096.java b/briar-android/src/main/java/info/guardianproject/GuardianProjectRSA4096.java
new file mode 100644
index 0000000000000000000000000000000000000000..b4e144659876e0fa6c0842f229a1e5f9cb608ab2
--- /dev/null
+++ b/briar-android/src/main/java/info/guardianproject/GuardianProjectRSA4096.java
@@ -0,0 +1,116 @@
+package info.guardianproject;
+
+import info.guardianproject.trustedintents.ApkSignaturePin;
+
+/**
+ * This is the second Guardian Project APK signing key. It was generated since
+ * RSA 1024-bit keys are deprecated. So any new Guardian Project app will be
+ * signed by this key. It is used to sign these apps:
+ * <ul>
+ * <li>Checkey</li>
+ * <li>Courier</li>
+ * </ul>
+ *
+ * @author hans
+ */
+public final class GuardianProjectRSA4096 extends ApkSignaturePin {
+
+   public GuardianProjectRSA4096() {
+      fingerprints = new String[] {
+              "f006a20481c71a690de02e385ab0c9fa4ac1245240f68102682703ba0656867a",
+      };
+      certificates = new byte[][] {
+              {
+                      48, -126, 5, -84, 48, -126, 3, -108, 2, 9, 0, -126, -20, 93, -43, 112, 34,
+                      -87, 29, 48, 13, 6, 9, 42, -122, 72, -122, -9, 13, 1, 1, 5, 5, 0, 48, -127,
+                      -105, 49, 11, 48, 9, 6, 3, 85, 4, 6, 19, 2, 85, 83, 49, 17, 48, 15, 6, 3,
+                      85, 4, 8, 12, 8, 78, 101, 119, 32, 89, 111, 114, 107, 49, 17, 48, 15, 6, 3,
+                      85, 4, 7, 12, 8, 78, 101, 119, 32, 89, 111, 114, 107, 49, 25, 48, 23, 6, 3,
+                      85, 4, 10, 12, 16, 71, 117, 97, 114, 100, 105, 97, 110, 32, 80, 114, 111,
+                      106, 101, 99, 116, 49, 29, 48, 27, 6, 3, 85, 4, 3, 12, 20, 103, 117, 97,
+                      114, 100, 105, 97, 110, 112, 114, 111, 106, 101, 99, 116, 46, 105, 110,
+                      102, 111, 49, 40, 48, 38, 6, 9, 42, -122, 72, -122, -9, 13, 1, 9, 1, 22,
+                      25, 114, 111, 111, 116, 64, 103, 117, 97, 114, 100, 105, 97, 110, 112, 114,
+                      111, 106, 101, 99, 116, 46, 105, 110, 102, 111, 48, 30, 23, 13, 49, 52, 48,
+                      53, 49, 52, 49, 55, 53, 55, 50, 57, 90, 23, 13, 52, 49, 48, 57, 50, 56, 49,
+                      55, 53, 55, 50, 57, 90, 48, -127, -105, 49, 11, 48, 9, 6, 3, 85, 4, 6, 19,
+                      2, 85, 83, 49, 17, 48, 15, 6, 3, 85, 4, 8, 12, 8, 78, 101, 119, 32, 89,
+                      111, 114, 107, 49, 17, 48, 15, 6, 3, 85, 4, 7, 12, 8, 78, 101, 119, 32, 89,
+                      111, 114, 107, 49, 25, 48, 23, 6, 3, 85, 4, 10, 12, 16, 71, 117, 97, 114,
+                      100, 105, 97, 110, 32, 80, 114, 111, 106, 101, 99, 116, 49, 29, 48, 27, 6,
+                      3, 85, 4, 3, 12, 20, 103, 117, 97, 114, 100, 105, 97, 110, 112, 114, 111,
+                      106, 101, 99, 116, 46, 105, 110, 102, 111, 49, 40, 48, 38, 6, 9, 42, -122,
+                      72, -122, -9, 13, 1, 9, 1, 22, 25, 114, 111, 111, 116, 64, 103, 117, 97,
+                      114, 100, 105, 97, 110, 112, 114, 111, 106, 101, 99, 116, 46, 105, 110,
+                      102, 111, 48, -126, 2, 34, 48, 13, 6, 9, 42, -122, 72, -122, -9, 13, 1, 1,
+                      1, 5, 0, 3, -126, 2, 15, 0, 48, -126, 2, 10, 2, -126, 2, 1, 0, -51, 108,
+                      83, -44, 61, 81, 46, 61, 2, -61, 46, 60, 2, -30, 44, 38, -70, -63, -93,
+                      -66, -57, 1, 2, -32, -80, -82, 98, -26, -70, -34, 60, -65, -55, -43, 16,
+                      -63, -89, -104, 50, 108, -26, -2, -3, -55, -77, 47, 75, 89, 99, 12, -32,
+                      32, 120, -26, -81, 54, 95, -57, -114, -100, -39, -110, -4, 120, 90, 90,
+                      -40, -89, -53, 63, -122, -45, -80, 32, -6, -12, -29, -107, 45, 10, -23, 76,
+                      5, 112, -15, -63, 48, 35, -61, 0, -107, -110, 44, -46, -126, -30, -30, -33,
+                      86, 22, 30, 8, -72, 29, 75, 121, 31, -120, 119, 59, -57, 19, -64, 31, 84,
+                      -94, -38, 91, 82, 92, -95, 66, 2, 120, -37, -113, 126, 54, -83, 83, -125,
+                      122, 110, -106, 80, 59, -127, -72, -23, 64, 105, 20, 25, -41, -3, -61, -44,
+                      51, -28, 17, 36, -90, -18, -25, 96, 37, -93, -48, 98, 47, 27, 49, 40, -31,
+                      -62, -102, -49, 28, -55, 50, -38, -70, -83, 101, 97, 96, -122, -114, 18,
+                      47, 119, 117, -7, -55, -64, -1, 96, -120, 61, -89, -70, -7, -89, 113, -41,
+                      88, 27, 26, 95, -52, 53, 59, 7, 11, 79, 86, 31, -109, -21, 120, -15, 38,
+                      106, 33, -121, 82, 18, 45, 32, 49, 93, -26, -74, -104, 4, -122, 96, 39,
+                      126, -24, 16, 119, -45, -119, 110, -31, 55, -109, 53, 53, -11, -58, -124,
+                      -84, 41, -42, 64, 17, -5, -78, -57, -100, 118, -105, -38, -94, 84, -16,
+                      -53, -106, -11, 76, 81, 70, -83, -56, 73, -96, -100, -18, 55, -3, -3, 34,
+                      -97, -62, 59, -17, -79, 91, -9, 122, 95, -108, -121, -76, -62, -72, 61,
+                      -82, 105, -99, -59, 10, 51, 52, 77, -105, -127, 37, 79, 88, -127, 27, 39,
+                      44, 15, 123, -59, -118, -96, 61, -28, 23, -54, 124, 100, 57, 37, 123, -83,
+                      -124, 11, 123, 73, -53, 18, 119, -39, -13, 46, 123, -55, 4, -91, 114, 93,
+                      -116, -98, 21, 95, -30, -82, -108, 87, -65, -8, 30, 67, 14, 22, 79, -64,
+                      86, -128, -83, 74, 69, -42, 9, -18, -120, -52, 7, 62, 78, 88, -53, -125,
+                      41, -122, -91, -34, -110, 111, -118, -25, 25, -83, 90, -95, 84, -121, 95,
+                      72, -53, -14, -14, -48, 65, 4, 23, 99, 56, 23, -20, 9, 46, 63, 83, -26,
+                      -86, 54, -104, 79, 9, 94, -91, -69, 10, -125, -17, -28, -32, -79, 5, -11,
+                      37, 103, -46, -75, 71, -119, 39, 48, -53, -51, 118, 43, 28, 68, 14, -33,
+                      -82, -76, -98, 1, 41, 94, -128, -86, 51, -89, 17, -31, 38, -70, -2, -27,
+                      -105, -87, 103, 93, 19, 73, -106, -82, -76, 110, -48, -124, -51, 92, -91,
+                      -51, 22, 1, -48, 52, -127, -24, 26, -77, 4, 22, 33, 24, -128, -1, 9, -42,
+                      23, -53, 78, 10, -39, -115, -95, 17, 100, 90, 16, -23, -127, -38, 10, -62,
+                      -64, 113, -115, -114, 78, -11, -124, 113, 113, -42, -66, 114, -98, -40,
+                      -41, 2, 3, 1, 0, 1, 48, 13, 6, 9, 42, -122, 72, -122, -9, 13, 1, 1, 5, 5,
+                      0, 3, -126, 2, 1, 0, -54, 125, -113, -9, -45, 82, 2, -79, -87, 31, -17,
+                      -10, 117, 16, 1, 67, -63, 57, -49, -81, -90, 48, 7, -58, 89, -29, 120, 84,
+                      116, 51, 54, -94, 74, -111, -11, 53, -13, 53, -125, -76, -64, 46, -35, 19,
+                      -19, 25, 36, -82, 66, 113, -14, -6, -63, 83, 15, 8, -77, -74, -94, -53,
+                      -35, -61, -75, 52, 13, -128, 9, 96, 66, 46, 46, -57, 24, -28, -39, -46, 96,
+                      -115, -63, 92, -70, 51, 49, -94, 96, 77, 16, 108, -59, -28, 112, -2, -3,
+                      -87, 27, 56, 118, 29, -95, -76, -70, 34, -105, -24, -104, 70, 24, -88, -29,
+                      -28, -101, -98, 24, -48, -32, -111, 97, 61, -70, -21, -111, 70, -55, 68,
+                      -76, 125, -61, 56, -122, 48, -118, 74, 61, -101, -46, -43, -12, -114, -116,
+                      -57, -108, 91, -109, -62, -117, -76, -48, 109, 81, -22, -113, -73, 64, -61,
+                      102, 92, -117, -9, -100, 62, -90, 99, 102, -50, -41, -75, 31, 5, -76, -31,
+                      -85, 118, -57, -21, 102, 71, 41, -34, -45, -92, 88, 82, -95, 65, -100, -31,
+                      -28, -85, -37, 94, -52, 72, 39, 55, -42, 18, 29, 115, 23, -106, -2, -54,
+                      -45, 61, 53, 62, 107, 109, -65, 69, 4, -123, 124, -30, -54, -44, 38, 119,
+                      49, -123, -27, -50, 77, -9, -40, -114, -50, -70, -123, 86, -115, 127, 45,
+                      42, 23, -25, -83, -81, -38, -84, -3, 99, -36, 12, -67, -39, -110, 21, -40,
+                      -128, 6, -96, -24, -116, -62, 63, 127, 39, 57, -83, -63, 0, 127, -12, 73,
+                      85, -41, -101, -70, -48, -94, -94, -73, -38, -115, -62, -34, 62, -92, 96,
+                      16, 6, -19, -84, 38, -93, -117, -52, 32, 92, -21, 123, -117, 81, 50, -71,
+                      103, 121, 127, 4, -3, -40, 62, 100, 22, -123, -68, -69, -54, -127, -67, 50,
+                      -114, 77, -30, 26, -102, 29, 106, 48, 83, 99, 73, 96, 124, -77, 51, 8, 15,
+                      40, 72, -108, 105, 62, 119, -113, -90, 57, -62, 127, -57, -21, -40, -109,
+                      96, 101, 71, -40, -101, 127, 69, 110, 43, 59, -102, -8, -42, -70, -24, 51,
+                      -51, 54, 42, -110, -119, 41, -101, 45, -101, -124, 56, -75, -26, 86, -65,
+                      54, 21, -88, -30, 79, -26, -127, 121, -102, -48, -25, -62, 99, 76, -90,
+                      -48, -37, 123, 9, 67, 51, -41, -116, 29, 69, 88, 93, -42, 23, 73, -112, 24,
+                      -85, 60, 1, 3, -95, 12, -49, -55, 95, 109, -37, 10, -124, 119, -52, -31,
+                      91, 55, -67, 99, 87, -55, 97, 25, -9, -119, -41, -98, 100, -14, 70, -44,
+                      -63, 60, -127, -99, 15, 49, 22, -118, -49, 66, -106, 36, -34, -5, 6, -48,
+                      123, -79, 115, 57, 30, -3, -34, -67, 91, 34, 3, -52, -106, 79, -63, 125,
+                      123, -16, -120, -53, -98, 34, 86, -60, 94, 78, -91, -34, 0, -8, 73, -119,
+                      -87, 12, -101, -112, -10, -79, 10, 105, -82, 120, -106, -9, 99, 57, -63,
+                      -26, 125, -80, 102, -106, -11, -91, -1, 37, 33
+              },
+      };
+   }
+}
diff --git a/briar-android/src/main/java/info/guardianproject/LICENSE.txt b/briar-android/src/main/java/info/guardianproject/LICENSE.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4362b49151d7b34ef83b3067a8f9c9f877d72a0e
--- /dev/null
+++ b/briar-android/src/main/java/info/guardianproject/LICENSE.txt
@@ -0,0 +1,502 @@
+                  GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 2.1, February 1999
+
+ Copyright (C) 1991, 1999 Free Software Foundation, Inc.
+ 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+[This is the first released version of the Lesser GPL.  It also counts
+ as the successor of the GNU Library Public License, version 2, hence
+ the version number 2.1.]
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+Licenses are intended to guarantee your freedom to share and change
+free software--to make sure the software is free for all its users.
+
+  This license, the Lesser General Public License, applies to some
+specially designated software packages--typically libraries--of the
+Free Software Foundation and other authors who decide to use it.  You
+can use it too, but we suggest you first think carefully about whether
+this license or the ordinary General Public License is the better
+strategy to use in any particular case, based on the explanations below.
+
+  When we speak of free software, we are referring to freedom of use,
+not price.  Our General Public Licenses are designed to make sure that
+you have the freedom to distribute copies of free software (and charge
+for this service if you wish); that you receive source code or can get
+it if you want it; that you can change the software and use pieces of
+it in new free programs; and that you are informed that you can do
+these things.
+
+  To protect your rights, we need to make restrictions that forbid
+distributors to deny you these rights or to ask you to surrender these
+rights.  These restrictions translate to certain responsibilities for
+you if you distribute copies of the library or if you modify it.
+
+  For example, if you distribute copies of the library, whether gratis
+or for a fee, you must give the recipients all the rights that we gave
+you.  You must make sure that they, too, receive or can get the source
+code.  If you link other code with the library, you must provide
+complete object files to the recipients, so that they can relink them
+with the library after making changes to the library and recompiling
+it.  And you must show them these terms so they know their rights.
+
+  We protect your rights with a two-step method: (1) we copyright the
+library, and (2) we offer you this license, which gives you legal
+permission to copy, distribute and/or modify the library.
+
+  To protect each distributor, we want to make it very clear that
+there is no warranty for the free library.  Also, if the library is
+modified by someone else and passed on, the recipients should know
+that what they have is not the original version, so that the original
+author's reputation will not be affected by problems that might be
+introduced by others.
+
+  Finally, software patents pose a constant threat to the existence of
+any free program.  We wish to make sure that a company cannot
+effectively restrict the users of a free program by obtaining a
+restrictive license from a patent holder.  Therefore, we insist that
+any patent license obtained for a version of the library must be
+consistent with the full freedom of use specified in this license.
+
+  Most GNU software, including some libraries, is covered by the
+ordinary GNU General Public License.  This license, the GNU Lesser
+General Public License, applies to certain designated libraries, and
+is quite different from the ordinary General Public License.  We use
+this license for certain libraries in order to permit linking those
+libraries into non-free programs.
+
+  When a program is linked with a library, whether statically or using
+a shared library, the combination of the two is legally speaking a
+combined work, a derivative of the original library.  The ordinary
+General Public License therefore permits such linking only if the
+entire combination fits its criteria of freedom.  The Lesser General
+Public License permits more lax criteria for linking other code with
+the library.
+
+  We call this license the "Lesser" General Public License because it
+does Less to protect the user's freedom than the ordinary General
+Public License.  It also provides other free software developers Less
+of an advantage over competing non-free programs.  These disadvantages
+are the reason we use the ordinary General Public License for many
+libraries.  However, the Lesser license provides advantages in certain
+special circumstances.
+
+  For example, on rare occasions, there may be a special need to
+encourage the widest possible use of a certain library, so that it becomes
+a de-facto standard.  To achieve this, non-free programs must be
+allowed to use the library.  A more frequent case is that a free
+library does the same job as widely used non-free libraries.  In this
+case, there is little to gain by limiting the free library to free
+software only, so we use the Lesser General Public License.
+
+  In other cases, permission to use a particular library in non-free
+programs enables a greater number of people to use a large body of
+free software.  For example, permission to use the GNU C Library in
+non-free programs enables many more people to use the whole GNU
+operating system, as well as its variant, the GNU/Linux operating
+system.
+
+  Although the Lesser General Public License is Less protective of the
+users' freedom, it does ensure that the user of a program that is
+linked with the Library has the freedom and the wherewithal to run
+that program using a modified version of the Library.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.  Pay close attention to the difference between a
+"work based on the library" and a "work that uses the library".  The
+former contains code derived from the library, whereas the latter must
+be combined with the library in order to run.
+
+                  GNU LESSER GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License Agreement applies to any software library or other
+program which contains a notice placed by the copyright holder or
+other authorized party saying it may be distributed under the terms of
+this Lesser General Public License (also called "this License").
+Each licensee is addressed as "you".
+
+  A "library" means a collection of software functions and/or data
+prepared so as to be conveniently linked with application programs
+(which use some of those functions and data) to form executables.
+
+  The "Library", below, refers to any such software library or work
+which has been distributed under these terms.  A "work based on the
+Library" means either the Library or any derivative work under
+copyright law: that is to say, a work containing the Library or a
+portion of it, either verbatim or with modifications and/or translated
+straightforwardly into another language.  (Hereinafter, translation is
+included without limitation in the term "modification".)
+
+  "Source code" for a work means the preferred form of the work for
+making modifications to it.  For a library, complete source code means
+all the source code for all modules it contains, plus any associated
+interface definition files, plus the scripts used to control compilation
+and installation of the library.
+
+  Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running a program using the Library is not restricted, and output from
+such a program is covered only if its contents constitute a work based
+on the Library (independent of the use of the Library in a tool for
+writing it).  Whether that is true depends on what the Library does
+and what the program that uses the Library does.
+
+  1. You may copy and distribute verbatim copies of the Library's
+complete source code as you receive it, in any medium, provided that
+you conspicuously and appropriately publish on each copy an
+appropriate copyright notice and disclaimer of warranty; keep intact
+all the notices that refer to this License and to the absence of any
+warranty; and distribute a copy of this License along with the
+Library.
+
+  You may charge a fee for the physical act of transferring a copy,
+and you may at your option offer warranty protection in exchange for a
+fee.
+
+  2. You may modify your copy or copies of the Library or any portion
+of it, thus forming a work based on the Library, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+    a) The modified work must itself be a software library.
+
+    b) You must cause the files modified to carry prominent notices
+    stating that you changed the files and the date of any change.
+
+    c) You must cause the whole of the work to be licensed at no
+    charge to all third parties under the terms of this License.
+
+    d) If a facility in the modified Library refers to a function or a
+    table of data to be supplied by an application program that uses
+    the facility, other than as an argument passed when the facility
+    is invoked, then you must make a good faith effort to ensure that,
+    in the event an application does not supply such function or
+    table, the facility still operates, and performs whatever part of
+    its purpose remains meaningful.
+
+    (For example, a function in a library to compute square roots has
+    a purpose that is entirely well-defined independent of the
+    application.  Therefore, Subsection 2d requires that any
+    application-supplied function or table used by this function must
+    be optional: if the application does not supply it, the square
+    root function must still compute square roots.)
+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Library,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works.  But when you
+distribute the same sections as part of a whole which is a work based
+on the Library, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote
+it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Library.
+
+In addition, mere aggregation of another work not based on the Library
+with the Library (or with a work based on the Library) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+  3. You may opt to apply the terms of the ordinary GNU General Public
+License instead of this License to a given copy of the Library.  To do
+this, you must alter all the notices that refer to this License, so
+that they refer to the ordinary GNU General Public License, version 2,
+instead of to this License.  (If a newer version than version 2 of the
+ordinary GNU General Public License has appeared, then you can specify
+that version instead if you wish.)  Do not make any other change in
+these notices.
+
+  Once this change is made in a given copy, it is irreversible for
+that copy, so the ordinary GNU General Public License applies to all
+subsequent copies and derivative works made from that copy.
+
+  This option is useful when you wish to copy part of the code of
+the Library into a program that is not a library.
+
+  4. You may copy and distribute the Library (or a portion or
+derivative of it, under Section 2) in object code or executable form
+under the terms of Sections 1 and 2 above provided that you accompany
+it with the complete corresponding machine-readable source code, which
+must be distributed under the terms of Sections 1 and 2 above on a
+medium customarily used for software interchange.
+
+  If distribution of object code is made by offering access to copy
+from a designated place, then offering equivalent access to copy the
+source code from the same place satisfies the requirement to
+distribute the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+  5. A program that contains no derivative of any portion of the
+Library, but is designed to work with the Library by being compiled or
+linked with it, is called a "work that uses the Library".  Such a
+work, in isolation, is not a derivative work of the Library, and
+therefore falls outside the scope of this License.
+
+  However, linking a "work that uses the Library" with the Library
+creates an executable that is a derivative of the Library (because it
+contains portions of the Library), rather than a "work that uses the
+library".  The executable is therefore covered by this License.
+Section 6 states terms for distribution of such executables.
+
+  When a "work that uses the Library" uses material from a header file
+that is part of the Library, the object code for the work may be a
+derivative work of the Library even though the source code is not.
+Whether this is true is especially significant if the work can be
+linked without the Library, or if the work is itself a library.  The
+threshold for this to be true is not precisely defined by law.
+
+  If such an object file uses only numerical parameters, data
+structure layouts and accessors, and small macros and small inline
+functions (ten lines or less in length), then the use of the object
+file is unrestricted, regardless of whether it is legally a derivative
+work.  (Executables containing this object code plus portions of the
+Library will still fall under Section 6.)
+
+  Otherwise, if the work is a derivative of the Library, you may
+distribute the object code for the work under the terms of Section 6.
+Any executables containing that work also fall under Section 6,
+whether or not they are linked directly with the Library itself.
+
+  6. As an exception to the Sections above, you may also combine or
+link a "work that uses the Library" with the Library to produce a
+work containing portions of the Library, and distribute that work
+under terms of your choice, provided that the terms permit
+modification of the work for the customer's own use and reverse
+engineering for debugging such modifications.
+
+  You must give prominent notice with each copy of the work that the
+Library is used in it and that the Library and its use are covered by
+this License.  You must supply a copy of this License.  If the work
+during execution displays copyright notices, you must include the
+copyright notice for the Library among them, as well as a reference
+directing the user to the copy of this License.  Also, you must do one
+of these things:
+
+    a) Accompany the work with the complete corresponding
+    machine-readable source code for the Library including whatever
+    changes were used in the work (which must be distributed under
+    Sections 1 and 2 above); and, if the work is an executable linked
+    with the Library, with the complete machine-readable "work that
+    uses the Library", as object code and/or source code, so that the
+    user can modify the Library and then relink to produce a modified
+    executable containing the modified Library.  (It is understood
+    that the user who changes the contents of definitions files in the
+    Library will not necessarily be able to recompile the application
+    to use the modified definitions.)
+
+    b) Use a suitable shared library mechanism for linking with the
+    Library.  A suitable mechanism is one that (1) uses at run time a
+    copy of the library already present on the user's computer system,
+    rather than copying library functions into the executable, and (2)
+    will operate properly with a modified version of the library, if
+    the user installs one, as long as the modified version is
+    interface-compatible with the version that the work was made with.
+
+    c) Accompany the work with a written offer, valid for at
+    least three years, to give the same user the materials
+    specified in Subsection 6a, above, for a charge no more
+    than the cost of performing this distribution.
+
+    d) If distribution of the work is made by offering access to copy
+    from a designated place, offer equivalent access to copy the above
+    specified materials from the same place.
+
+    e) Verify that the user has already received a copy of these
+    materials or that you have already sent this user a copy.
+
+  For an executable, the required form of the "work that uses the
+Library" must include any data and utility programs needed for
+reproducing the executable from it.  However, as a special exception,
+the materials to be distributed need not include anything that is
+normally distributed (in either source or binary form) with the major
+components (compiler, kernel, and so on) of the operating system on
+which the executable runs, unless that component itself accompanies
+the executable.
+
+  It may happen that this requirement contradicts the license
+restrictions of other proprietary libraries that do not normally
+accompany the operating system.  Such a contradiction means you cannot
+use both them and the Library together in an executable that you
+distribute.
+
+  7. You may place library facilities that are a work based on the
+Library side-by-side in a single library together with other library
+facilities not covered by this License, and distribute such a combined
+library, provided that the separate distribution of the work based on
+the Library and of the other library facilities is otherwise
+permitted, and provided that you do these two things:
+
+    a) Accompany the combined library with a copy of the same work
+    based on the Library, uncombined with any other library
+    facilities.  This must be distributed under the terms of the
+    Sections above.
+
+    b) Give prominent notice with the combined library of the fact
+    that part of it is a work based on the Library, and explaining
+    where to find the accompanying uncombined form of the same work.
+
+  8. You may not copy, modify, sublicense, link with, or distribute
+the Library except as expressly provided under this License.  Any
+attempt otherwise to copy, modify, sublicense, link with, or
+distribute the Library is void, and will automatically terminate your
+rights under this License.  However, parties who have received copies,
+or rights, from you under this License will not have their licenses
+terminated so long as such parties remain in full compliance.
+
+  9. You are not required to accept this License, since you have not
+signed it.  However, nothing else grants you permission to modify or
+distribute the Library or its derivative works.  These actions are
+prohibited by law if you do not accept this License.  Therefore, by
+modifying or distributing the Library (or any work based on the
+Library), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Library or works based on it.
+
+  10. Each time you redistribute the Library (or any work based on the
+Library), the recipient automatically receives a license from the
+original licensor to copy, distribute, link with or modify the Library
+subject to these terms and conditions.  You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties with
+this License.
+
+  11. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Library at all.  For example, if a patent
+license would not permit royalty-free redistribution of the Library by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Library.
+
+If any portion of this section is held invalid or unenforceable under any
+particular circumstance, the balance of the section is intended to apply,
+and the section as a whole is intended to apply in other circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system which is
+implemented by public license practices.  Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  12. If the distribution and/or use of the Library is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Library under this License may add
+an explicit geographical distribution limitation excluding those countries,
+so that distribution is permitted only in or among countries not thus
+excluded.  In such case, this License incorporates the limitation as if
+written in the body of this License.
+
+  13. The Free Software Foundation may publish revised and/or new
+versions of the Lesser General Public License from time to time.
+Such new versions will be similar in spirit to the present version,
+but may differ in detail to address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Library
+specifies a version number of this License which applies to it and
+"any later version", you have the option of following the terms and
+conditions either of that version or of any later version published by
+the Free Software Foundation.  If the Library does not specify a
+license version number, you may choose any version ever published by
+the Free Software Foundation.
+
+  14. If you wish to incorporate parts of the Library into other free
+programs whose distribution conditions are incompatible with these,
+write to the author to ask for permission.  For software which is
+copyrighted by the Free Software Foundation, write to the Free
+Software Foundation; we sometimes make exceptions for this.  Our
+decision will be guided by the two goals of preserving the free status
+of all derivatives of our free software and of promoting the sharing
+and reuse of software generally.
+
+                            NO WARRANTY
+
+  15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
+WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
+EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
+OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY
+KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
+LIBRARY IS WITH YOU.  SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
+THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
+WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
+AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
+FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
+CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
+LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
+RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
+FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
+SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+DAMAGES.
+
+                     END OF TERMS AND CONDITIONS
+
+           How to Apply These Terms to Your New Libraries
+
+  If you develop a new library, and you want it to be of the greatest
+possible use to the public, we recommend making it free software that
+everyone can redistribute and change.  You can do so by permitting
+redistribution under these terms (or, alternatively, under the terms of the
+ordinary General Public License).
+
+  To apply these terms, attach the following notices to the library.  It is
+safest to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least the
+"copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the library's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+Also add information on how to contact you by electronic and paper mail.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the library, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the
+  library `Frob' (a library for tweaking knobs) written by James Random Hacker.
+
+  <signature of Ty Coon>, 1 April 1990
+  Ty Coon, President of Vice
+
+That's all there is to it!
diff --git a/briar-android/src/main/java/info/guardianproject/trustedintents/ApkSignaturePin.java b/briar-android/src/main/java/info/guardianproject/trustedintents/ApkSignaturePin.java
new file mode 100644
index 0000000000000000000000000000000000000000..ba53de8bfe15575a63a05919fc069d54c041f19e
--- /dev/null
+++ b/briar-android/src/main/java/info/guardianproject/trustedintents/ApkSignaturePin.java
@@ -0,0 +1,86 @@
+package info.guardianproject.trustedintents;
+
+import android.content.pm.Signature;
+
+import java.math.BigInteger;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.Arrays;
+
+public abstract class ApkSignaturePin {
+
+	protected String[] fingerprints; // hex-encoded SHA-256 hashes of the certs
+	protected byte[][] certificates; // array of DER-encoded X.509 certificates
+	private Signature[] signatures;
+
+	public Signature[] getSignatures() {
+		if (signatures == null) {
+			signatures = new Signature[certificates.length];
+			for (int i = 0; i < certificates.length; i++)
+				signatures[i] = new Signature(certificates[i]);
+		}
+		return signatures;
+	}
+
+	/**
+	 * Gets the fingerprint of the first certificate in the signature.
+	 *
+	 * @param algorithm - Which hash to use (e.g. MD5, SHA1, SHA-256)
+	 * @return the fingerprint as hex String
+	 */
+	public String getFingerprint(String algorithm) {
+		try {
+			MessageDigest md = MessageDigest.getInstance(algorithm);
+			byte[] hashBytes = md.digest(certificates[0]);
+			BigInteger bi = new BigInteger(1, hashBytes);
+			md.reset();
+			return String.format("%0" + (hashBytes.length << 1) + "x", bi);
+		} catch (NoSuchAlgorithmException e) {
+			e.printStackTrace();
+		}
+		return null;
+	}
+
+	/**
+	 * Gets the MD5 fingerprint of the first certificate in the signature.
+	 *
+	 * @return the MD5 sum as hex String
+	 */
+	public String getMD5Fingerprint() {
+		return getFingerprint("MD5");
+	}
+
+	/**
+	 * Gets the SHA1 fingerprint of the first certificate in the signature.
+	 *
+	 * @return the SHA1 sum as hex String
+	 */
+	public String getSHA1Fingerprint() {
+		return getFingerprint("SHA1");
+	}
+
+	/**
+	 * Gets the SHA-256 fingerprint of the first certificate in the signature.
+	 *
+	 * @return the SHA-256 sum as hex String
+	 */
+	public String getSHA256Fingerprint() {
+		return getFingerprint("SHA-256");
+	}
+
+	/**
+	 * Compares the calculated SHA-256 cert fingerprint to the stored one.
+	 *
+	 * @return the result of the comparison
+	 */
+	public boolean doFingerprintsMatchCertificates() {
+		if (fingerprints == null || certificates == null)
+			return false;
+		String[] calcedFingerprints = new String[certificates.length];
+		for (int i = 0; i < calcedFingerprints.length; i++)
+			calcedFingerprints[i] = getSHA256Fingerprint();
+		if (fingerprints.length == 0 || calcedFingerprints.length == 0)
+			return false;
+		return Arrays.equals(fingerprints, calcedFingerprints);
+	}
+}
diff --git a/briar-android/src/main/java/info/guardianproject/trustedintents/TrustedIntents.java b/briar-android/src/main/java/info/guardianproject/trustedintents/TrustedIntents.java
new file mode 100644
index 0000000000000000000000000000000000000000..e9a735cf3dd0f44c90f32baa0fb4f8f7d668a83b
--- /dev/null
+++ b/briar-android/src/main/java/info/guardianproject/trustedintents/TrustedIntents.java
@@ -0,0 +1,270 @@
+package info.guardianproject.trustedintents;
+
+import android.app.Activity;
+import android.content.ActivityNotFoundException;
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.ActivityInfo;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import android.content.pm.PackageManager.NameNotFoundException;
+import android.content.pm.ResolveInfo;
+import android.content.pm.Signature;
+import android.text.TextUtils;
+import android.util.Log;
+
+import java.lang.reflect.Constructor;
+import java.security.cert.CertificateException;
+import java.util.LinkedHashSet;
+
+public class TrustedIntents {
+
+   private static TrustedIntents instance;
+
+   private static PackageManager pm;
+
+   private final LinkedHashSet<ApkSignaturePin> pinList;
+
+   private TrustedIntents(Context context) {
+      pm = context.getPackageManager();
+      this.pinList = new LinkedHashSet<ApkSignaturePin>();
+   }
+
+   public static TrustedIntents get(Context context) {
+      if (instance == null)
+         instance = new TrustedIntents(context);
+      return instance;
+   }
+
+   /**
+    * Check whether a resolved {@link Activity} is trusted.
+    *
+    * @param resolveInfo the one to check
+    * @return whether the {@code Intent}'s receiver is trusted
+    */
+   public boolean isReceiverTrusted(ResolveInfo resolveInfo) {
+      return isPackageNameTrusted(resolveInfo.activityInfo.packageName);
+   }
+
+   /**
+    * Check whether a resolved {@link Activity} is trusted.
+    *
+    * @param activityInfo the one to check
+    * @return whether the {@code Intent}'s receiver is trusted
+    */
+   public boolean isReceiverTrusted(ActivityInfo activityInfo) {
+      return isPackageNameTrusted(activityInfo.packageName);
+   }
+
+   /**
+    * Check an {@link Intent} is trusted based on the {@code packageName} set
+    * by {@link Intent#setPackage(String)}
+    *
+    * @param intent the one to check
+    * @return whether the {@code Intent}'s receiver is trusted
+    */
+   public boolean isReceiverTrusted(Intent intent) {
+      if (!isIntentSane(intent))
+         return false;
+      String packageName = intent.getPackage();
+      if (TextUtils.isEmpty(packageName)) {
+         packageName = intent.getComponent().getPackageName();
+      }
+      return isPackageNameTrusted(packageName);
+   }
+
+   /**
+    * Check whether a {@code packageName} is trusted.
+    *
+    * @param packageName the one to check
+    * @return whether the {@code packageName} is trusted
+    */
+   public boolean isPackageNameTrusted(String packageName) {
+      try {
+         checkTrustedSigner(packageName);
+      } catch (NameNotFoundException e) {
+         e.printStackTrace();
+         return false;
+      } catch (CertificateException e) {
+         return false;
+      }
+      return true;
+   }
+
+   /**
+    * Returns an {@link Intent} if the sending app is signed by one of
+    * the trusted signing keys as set in {@link #addTrustedSigner(Class)}.
+    *
+    * @returns {@code null} if there is no {@code Intent} or if the
+    * sender is not trusted.
+    * @see #addTrustedSigner(Class)
+    */
+   public Intent getIntentFromTrustedSender(Activity activity) {
+      Intent intent = activity.getIntent();
+      String packageName = getCallingPackageName(activity);
+      if (TextUtils.isEmpty(packageName)) {
+         return null;
+      }
+      if (isPackageNameTrusted(packageName)) {
+         return intent;
+      }
+      return null;
+   }
+
+   /**
+    * Get the package name of the {@link Activity} that sent the
+    * {@link Intent} that started this {@code Activity}.
+    * <p/>
+    * <strong>WARNING</strong>: If the {@code Activity} has
+    * {@code android:launchMode="singleInstance"} or {@code "singleTask"}, then
+    * this method will not disconnect because it is not possible to get the
+    * calling {@code Activity}, as set by
+    * {@link Activity#startActivityForResult(Intent, int)}
+    *
+    * @param activity the {@code Activity} to check for the {@code Intent}
+    * @return the package of the sending app or {@code null} if it was not a
+    * {@code ACTION_CONNECT Intent} or the {@code Intent} was not sent
+    * with {@link Activity#startActivityForResult(Intent, int)}
+    */
+   public static String getCallingPackageName(Activity activity) {
+      // getCallingPackage() was unstable until android-18, use this
+      ComponentName componentName = activity.getCallingActivity();
+      if (componentName == null)
+         return null;
+      String packageName = componentName.getPackageName();
+      if (TextUtils.isEmpty(packageName)) {
+         Log.e(activity.getClass().getSimpleName(),
+                 "Received Intent without sender! The Intent must be sent using startActivityForResult() and received without launchMode singleTask or singleInstance!");
+      }
+      return packageName;
+   }
+
+   /**
+    * This is used to check whether an {@link Intent} that will be sent is
+    * complete. It should <strong>not</strong> be used with {@code Intent}s
+    * that have been received already.
+    */
+   private boolean isIntentSane(Intent intent) {
+      if (intent == null)
+         return false;
+      if (TextUtils.isEmpty(intent.getPackage())) {
+         ComponentName componentName = intent.getComponent();
+         if (componentName == null || TextUtils.isEmpty(componentName.getPackageName())) {
+            return false;
+         }
+      }
+      return true;
+   }
+
+   /**
+    * Add an APK signature that is always trusted for any packageName.
+    *
+    * @param cls {@link Class} of the {@link ApkSignaturePin} to trust
+    * @return boolean
+    * @throws {@link IllegalArgumentException} the class cannot be instantiated
+    */
+   public boolean addTrustedSigner(Class<? extends ApkSignaturePin> cls) {
+      try {
+         Constructor<? extends ApkSignaturePin> constructor = cls.getConstructor();
+         return pinList.add((ApkSignaturePin) constructor.newInstance((Object[]) null));
+      } catch (Exception e) {
+         e.printStackTrace();
+         throw new IllegalArgumentException(e);
+      }
+   }
+
+   /**
+    * Remove an APK signature from the trusted set.
+    *
+    * @param cls {@link Class} of the {@link ApkSignaturePin} to remove
+    */
+   public boolean removeTrustedSigner(Class<? extends ApkSignaturePin> cls) {
+      for (ApkSignaturePin pin : pinList) {
+         if (pin.getClass().equals(cls)) {
+            return pinList.remove(pin);
+         }
+      }
+      return false;
+   }
+
+   /**
+    * Remove all {@link ApkSignaturePin}s from the trusted set.
+    */
+   public boolean removeAllTrustedSigners() {
+      pinList.clear();
+      return pinList.isEmpty();
+   }
+
+   /**
+    * Check if a {@link ApkSignaturePin} is trusted.
+    *
+    * @param cls {@link Class} of the {@link ApkSignaturePin} to check
+    */
+   public boolean isTrustedSigner(Class<? extends ApkSignaturePin> cls) {
+      for (ApkSignaturePin pin : pinList) {
+         if (pin.getClass().equals(cls)) {
+            return true;
+         }
+      }
+      return false;
+   }
+
+   public void checkTrustedSigner(String packageName)
+           throws NameNotFoundException, CertificateException {
+      PackageInfo packageInfo = pm.getPackageInfo(packageName, PackageManager.GET_SIGNATURES);
+      checkTrustedSigner(packageInfo.signatures);
+   }
+
+   public void checkTrustedSigner(PackageInfo packageInfo)
+           throws NameNotFoundException, CertificateException {
+      checkTrustedSigner(packageInfo.signatures);
+   }
+
+   public void checkTrustedSigner(Signature[] signatures)
+           throws NameNotFoundException, CertificateException {
+      if (signatures == null || signatures.length == 0)
+         throw new CertificateException("signatures cannot be null or empty!");
+      for (int i = 0; i < signatures.length; i++)
+         if (signatures[i] == null || signatures[i].toByteArray().length == 0)
+            throw new CertificateException("Certificates cannot be null or empty!");
+
+      // check whether the APK signer is trusted for all apps
+      for (ApkSignaturePin pin : pinList)
+         if (areSignaturesEqual(signatures, pin.getSignatures()))
+            return; // found a matching trusted APK signer
+
+      throw new CertificateException("APK signatures did not match!");
+   }
+
+   public boolean areSignaturesEqual(Signature[] sigs0, Signature[] sigs1) {
+      // TODO where is Android's implementation of this that I can just call?
+      if (sigs0 == null || sigs1 == null)
+         return false;
+      if (sigs0.length == 0 || sigs1.length == 0)
+         return false;
+      if (sigs0.length != sigs1.length)
+         return false;
+      for (int i = 0; i < sigs0.length; i++)
+         if (!sigs0[i].equals(sigs1[i]))
+            return false;
+      return true;
+   }
+
+   public void startActivity(Context context, Intent intent) throws CertificateException {
+      if (!isIntentSane(intent))
+         throw new ActivityNotFoundException("The intent was null or empty!");
+      String packageName = intent.getPackage();
+      if (TextUtils.isEmpty(packageName)) {
+         packageName = intent.getComponent().getPackageName();
+         intent.setPackage(packageName);
+      }
+      try {
+         checkTrustedSigner(packageName);
+      } catch (NameNotFoundException e) {
+         e.printStackTrace();
+         throw new ActivityNotFoundException(e.getLocalizedMessage());
+      }
+      context.startActivity(intent);
+   }
+}
diff --git a/briar-android/witness.gradle b/briar-android/witness.gradle
index dcfee5197cf8656dcfc339f4f572e19e998ea776..927d07e6fb1febc90ef887f53e85a348c92aa240 100644
--- a/briar-android/witness.gradle
+++ b/briar-android/witness.gradle
@@ -1,5 +1,5 @@
 dependencyVerification {
-    verify = [
+	verify = [
             'androidx.activity:activity-ktx:1.2.3:activity-ktx-1.2.3.aar:423c0226e237e08de245cf66f8ccaf103854bc19a584d971a4a075fd15d70df1',
             'androidx.activity:activity:1.2.2:activity-1.2.2.aar:e165fb20f006b77894d349572cc3acd2760baa8416ae4d33cb8de6a84dd6730c',
             'androidx.activity:activity:1.2.4:activity-1.2.4.aar:ae8e9c7de57e387d2ad90e73f3a5a5dfd502bd4f034c1dccfdb3506d1d2df81a',
@@ -101,14 +101,13 @@ dependencyVerification {
             'com.google.j2objc:j2objc-annotations:1.3:j2objc-annotations-1.3.jar:21af30c92267bd6122c0e0b4d20cccb6641a37eaf956c6540ec471d584e64a7b',
             'com.google.zxing:core:3.3.3:core-3.3.3.jar:5820f81e943e4bce0329306621e2d6255d2930b0a6ce934c5c23c0d6d3f20599',
             'com.ibm.icu:icu4j:53.1:icu4j-53.1.jar:e37a4467bac5cdeb02c5c4b8e5063d2f4e67b69e3c7df6d6b610f13185572bab',
-            'com.jraska:falcon:2.1.1:falcon-2.1.1.aar:827f06556b7fa599f29a48a5277df39ca3dce5080d4ea6f9ea1f9c7b6b78bb7a',
+            'com.jraska:falcon:2.2.0:falcon-2.2.0.aar:8b016c6e016ef99fb493b8614b2362cfba540a68ac16a9bb6da310ae10e30b81',
             'com.squareup:javapoet:1.13.0:javapoet-1.13.0.jar:4c7517e848a71b36d069d12bb3bf46a70fd4cda3105d822b0ed2e19c00b69291',
             'com.squareup:javawriter:2.1.1:javawriter-2.1.1.jar:f699823d0081f69cbb676c1845ea222e0ada79bc88a53e5d22d8bd02d328f57e',
             'com.vanniktech:emoji-google:0.7.0:emoji-google-0.7.0.aar:b98966812e3f607ee823cde15dd9b3823c6f02e5587572b860b9d95e3f971402',
             'com.vanniktech:emoji:0.7.0:emoji-0.7.0.aar:66f5981f8b5f93e82d2d4b3fa4c6299904d686ca62a2366e61de723b20253707',
             'de.hdodenhof:circleimageview:3.1.0:circleimageview-3.1.0.aar:8e9965b54072ee159074a55df216e17d5a622c94ce915ef311b1a1f32660c7fb',
             'info.guardianproject.panic:panic:1.0:panic-1.0.jar:35116ab95212e67f94577faf67b88c11a6b21cbf9178b3f5b51d3dff45203ffd',
-            'info.guardianproject.trustedintents:trustedintents:0.2:trustedintents-0.2.jar:6221456d8821a8d974c2acf86306900237cf6afaaa94a4c9c44e161350f80f3e',
             'javax.annotation:javax.annotation-api:1.3.2:javax.annotation-api-1.3.2.jar:e04ba5195bcd555dc95650f7cc614d151e4bcd52d29a10b8aa2197f3ab89ab9b',
             'javax.annotation:jsr250-api:1.0:jsr250-api-1.0.jar:a1a922d0d9b6d183ed3800dfac01d1e1eb159f0e8c6f94736931c1def54a941f',
             'javax.inject:javax.inject:1:javax.inject-1.jar:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
@@ -173,7 +172,6 @@ dependencyVerification {
             'org.robolectric:shadows-framework:4.4:shadows-framework-4.4.jar:0602f5bbef601036831e0ce8600b6d08d80ce3c9260be5cb7b362b176ce3d9f0',
             'org.robolectric:utils-reflector:4.4:utils-reflector-4.4.jar:35a77865bb9a451e99b95575cb154a5f08ecb007bd17e390817c0f31ab9db869',
             'org.robolectric:utils:4.4:utils-4.4.jar:f9756b5c57116ae9ec55a65ca52b64ba1f77d30b5eb7b55fef5d125fdf7d69d9',
-            'tools.fastlane:screengrab:2.0.0:screengrab-2.0.0.aar:15ac15eb7c371db05e721be8d466567c2b7274b767d91478e781b6d89ee5d3d0',
-            'uk.co.samuelwall:material-tap-target-prompt:3.3.0:material-tap-target-prompt-3.3.0.aar:00f16e8d7e55d01e3b41cf66e09eee8588870ca7285ba3c72267ca0482f1606e',
-    ]
+            'tools.fastlane:screengrab:2.1.1:screengrab-2.1.1.aar:5a02781c0986e71ddbc691263115c2db70bdebb4b48d5b6dcf06ab1cb547d62d',
+            'uk.co.samuelwall:material-tap-target-prompt:3.3.0:material-tap-target-prompt-3.3.0.aar:00f16e8d7e55d01e3b41cf66e09eee8588870ca7285ba3c72267ca0482f1606e',]
 }
diff --git a/briar-headless/build.gradle b/briar-headless/build.gradle
index efff4722b08b349bc1403c3f02eba69b5a244caf..704bb1b01dbcf9caead97332931e17e197b56a02 100644
--- a/briar-headless/build.gradle
+++ b/briar-headless/build.gradle
@@ -37,9 +37,9 @@ dependencies {
 	testImplementation "org.junit.jupiter:junit-jupiter-api:$junitVersion"
 	testImplementation "org.junit.jupiter:junit-jupiter-params:$junitVersion"
 	testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:$junitVersion"
-	testImplementation 'io.mockk:mockk:1.10.4'
+	testImplementation 'io.mockk:mockk:1.12.4'
 	testImplementation 'org.skyscreamer:jsonassert:1.5.0'
-	testImplementation 'khttp:khttp:0.1.0'
+	testImplementation "com.squareup.okhttp3:okhttp:4.10.0"
 
 	kaptTest "com.google.dagger:dagger-compiler:$daggerVersion"
 }
diff --git a/briar-headless/src/test/java/org/briarproject/briar/headless/IntegrationTest.kt b/briar-headless/src/test/java/org/briarproject/briar/headless/IntegrationTest.kt
index ac26ea72dfa5890176a9b50a3e19da3fe799b5b2..3c66aac4f4d58790aab4abf1ef95fd651dce02c6 100644
--- a/briar-headless/src/test/java/org/briarproject/briar/headless/IntegrationTest.kt
+++ b/briar-headless/src/test/java/org/briarproject/briar/headless/IntegrationTest.kt
@@ -2,7 +2,11 @@ package org.briarproject.briar.headless
 
 import io.javalin.Javalin
 import io.javalin.core.util.Header.AUTHORIZATION
-import khttp.responses.Response
+import okhttp3.MediaType.Companion.toMediaType
+import okhttp3.OkHttpClient
+import okhttp3.Request
+import okhttp3.RequestBody.Companion.toRequestBody
+import okhttp3.Response
 import org.briarproject.bramble.BrambleCoreEagerSingletons
 import org.briarproject.bramble.api.crypto.CryptoComponent
 import org.briarproject.briar.BriarCoreEagerSingletons
@@ -22,6 +26,7 @@ abstract class IntegrationTest {
 
     private val dataDir = File("tmp")
 
+    private val client: OkHttpClient = OkHttpClient()
     protected lateinit var api: Javalin
     protected lateinit var crypto: CryptoComponent
     protected lateinit var testDataCreator: TestDataCreator
@@ -48,34 +53,55 @@ abstract class IntegrationTest {
         dataDir.deleteRecursively()
     }
 
-    protected fun get(url: String): Response {
-        return khttp.get(url, getAuthTokenHeader(token))
+    protected fun get(url: String, authToken: String = token): Response {
+        val request: Request = Request.Builder()
+            .url(url)
+            .header(AUTHORIZATION, "Bearer $authToken")
+            .build()
+        return client.newCall(request).execute()
     }
 
     protected fun getWithWrongToken(url: String): Response {
-        return khttp.get(url, getAuthTokenHeader("wrongToken"))
+        return get(url, "wrongToken")
     }
 
-    protected fun post(url: String, data: String): Response {
-        return khttp.post(url, getAuthTokenHeader(token), data = data)
+    protected fun post(url: String, data: String, authToken: String = token): Response {
+        val json = "application/json; charset=utf-8".toMediaType()
+        val body = data.toRequestBody(json)
+        val request: Request = Request.Builder()
+            .url(url)
+            .header(AUTHORIZATION, "Bearer $authToken")
+            .post(body)
+            .build()
+        return client.newCall(request).execute()
     }
 
     protected fun postWithWrongToken(url: String): Response {
-        return khttp.post(url, getAuthTokenHeader("wrongToken"), data = "")
+        return post(url, data = "", authToken = "wrongToken")
     }
 
-    protected fun delete(url: String): Response {
-        return khttp.delete(url, getAuthTokenHeader(token))
+    protected fun delete(url: String, authToken: String = token): Response {
+        val request: Request = Request.Builder()
+            .url(url)
+            .header(AUTHORIZATION, "Bearer $authToken")
+            .delete()
+            .build()
+        return client.newCall(request).execute()
     }
 
-    protected fun delete(url: String, data: String): Response {
-        return khttp.delete(url, getAuthTokenHeader(token), data = data)
+    protected fun delete(url: String, data: String, authToken: String = token): Response {
+        val json = "application/json; charset=utf-8".toMediaType()
+        val body = data.toRequestBody(json)
+        val request: Request = Request.Builder()
+            .url(url)
+            .header(AUTHORIZATION, "Bearer $authToken")
+            .delete(body)
+            .build()
+        return client.newCall(request).execute()
     }
 
     protected fun deleteWithWrongToken(url: String): Response {
-        return khttp.delete(url, getAuthTokenHeader("wrongToken"))
+        return delete(url, authToken = "wrongToken")
     }
 
-    private fun getAuthTokenHeader(token: String) = mapOf(Pair(AUTHORIZATION, "Bearer $token"))
-
 }
diff --git a/briar-headless/src/test/java/org/briarproject/briar/headless/contact/ContactControllerIntegrationTest.kt b/briar-headless/src/test/java/org/briarproject/briar/headless/contact/ContactControllerIntegrationTest.kt
index 9c4cfcc2a172330cb8f73fcfa28a9c3fe28b4973..2e1e345b7da762c2822a43b7f0b094e47cf61c20 100644
--- a/briar-headless/src/test/java/org/briarproject/briar/headless/contact/ContactControllerIntegrationTest.kt
+++ b/briar-headless/src/test/java/org/briarproject/briar/headless/contact/ContactControllerIntegrationTest.kt
@@ -1,26 +1,39 @@
 package org.briarproject.briar.headless.contact
 
+import okhttp3.Response
 import org.briarproject.bramble.api.contact.HandshakeLinkConstants.BASE32_LINK_BYTES
 import org.briarproject.briar.headless.IntegrationTest
 import org.briarproject.briar.headless.url
 import org.briarproject.briar.test.BriarTestUtils.getRealHandshakeLink
+import org.json.JSONArray
+import org.json.JSONObject
 import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Assertions.assertTrue
 import org.junit.jupiter.api.Test
 
 class ContactControllerIntegrationTest : IntegrationTest() {
 
+    /**
+     * Can only be called once.
+     */
+    private val Response.jsonArray: JSONArray get() = JSONArray(body?.use { it.string() })
+
+    /**
+     * Can only be called once.
+     */
+    private val Response.jsonObject: JSONObject get() = JSONObject(body?.use { it.string() })
+
     @Test
     fun `returning list of contacts needs authentication token`() {
         val response = getWithWrongToken("$url/contacts")
-        assertEquals(401, response.statusCode)
+        assertEquals(401, response.code)
     }
 
     @Test
     fun `returns list of contacts`() {
         // retrieve empty list of contacts
         var response = get("$url/contacts")
-        assertEquals(200, response.statusCode)
+        assertEquals(200, response.code)
         assertEquals(0, response.jsonArray.length())
 
         // add one test contact
@@ -29,9 +42,10 @@ class ContactControllerIntegrationTest : IntegrationTest() {
 
         // retrieve list with one test contact
         response = get("$url/contacts")
-        assertEquals(200, response.statusCode)
-        assertEquals(1, response.jsonArray.length())
-        val contact = response.jsonArray.getJSONObject(0)
+        assertEquals(200, response.code)
+        val jsonArray = response.jsonArray
+        assertEquals(1, jsonArray.length())
+        val contact = jsonArray.getJSONObject(0)
         val author = contact.getJSONObject("author")
         assertEquals(testContactName, author.getString("name"))
     }
@@ -39,7 +53,7 @@ class ContactControllerIntegrationTest : IntegrationTest() {
     @Test
     fun `returns own handshake link`() {
         val response = get("$url/contacts/add/link")
-        assertEquals(200, response.statusCode)
+        assertEquals(200, response.code)
         val link = response.jsonObject.getString("link")
         assertTrue(link.startsWith("briar://"))
         assertEquals(BASE32_LINK_BYTES + 8, link.length)
@@ -48,14 +62,14 @@ class ContactControllerIntegrationTest : IntegrationTest() {
     @Test
     fun `returning own handshake link needs authentication token`() {
         val response = getWithWrongToken("$url/contacts/add/link")
-        assertEquals(401, response.statusCode)
+        assertEquals(401, response.code)
     }
 
     @Test
     fun `returns list of pending contacts`() {
         // retrieve empty list of pending contacts
         var response = get("$url/contacts/add/pending")
-        assertEquals(200, response.statusCode)
+        assertEquals(200, response.code)
         assertEquals(0, response.jsonArray.length())
 
         // add one pending contact
@@ -65,37 +79,38 @@ class ContactControllerIntegrationTest : IntegrationTest() {
             "alias": "$alias"
         }"""
         response = post("$url/contacts/add/pending", json)
-        assertEquals(200, response.statusCode)
+        assertEquals(200, response.code)
 
         // get added contact as only list item
         response = get("$url/contacts/add/pending")
-        assertEquals(200, response.statusCode)
-        assertEquals(1, response.jsonArray.length())
-        val jsonObject = response.jsonArray.getJSONObject(0)
+        assertEquals(200, response.code)
+        val jsonArray = response.jsonArray
+        assertEquals(1, jsonArray.length())
+        val jsonObject = jsonArray.getJSONObject(0)
         assertEquals(alias, jsonObject.getJSONObject("pendingContact").getString("alias"))
 
         // remove pending contact again
         val idString = jsonObject.getJSONObject("pendingContact").getString("pendingContactId")
         val deleteJson = """{"pendingContactId": "$idString"}"""
-        response = delete("$url/contacts/add/pending", deleteJson)
-        assertEquals(200, response.statusCode)
+        response = delete("$url/contacts/add/pending", data = deleteJson)
+        assertEquals(200, response.code)
 
         // list of pending contacts should be empty now
         response = get("$url/contacts/add/pending")
-        assertEquals(200, response.statusCode)
+        assertEquals(200, response.code)
         assertEquals(0, response.jsonArray.length())
     }
 
     @Test
     fun `returning list of pending contacts needs authentication token`() {
         val response = getWithWrongToken("$url/contacts/add/pending")
-        assertEquals(401, response.statusCode)
+        assertEquals(401, response.code)
     }
 
     @Test
     fun `adding a pending contact needs authentication token`() {
         val response = postWithWrongToken("$url/contacts/add/pending")
-        assertEquals(401, response.statusCode)
+        assertEquals(401, response.code)
     }
 
     @Test
@@ -106,7 +121,7 @@ class ContactControllerIntegrationTest : IntegrationTest() {
             "alias": "$alias"
         }"""
         val response = post("$url/contacts/add/pending", json)
-        assertEquals(400, response.statusCode)
+        assertEquals(400, response.code)
         assertEquals("INVALID_LINK", response.jsonObject.getString("error"))
     }
 
@@ -118,7 +133,7 @@ class ContactControllerIntegrationTest : IntegrationTest() {
             "alias": "$alias"
         }"""
         val response = post("$url/contacts/add/pending", json)
-        assertEquals(400, response.statusCode)
+        assertEquals(400, response.code)
         assertEquals("INVALID_PUBLIC_KEY", response.jsonObject.getString("error"))
     }
 
@@ -130,36 +145,37 @@ class ContactControllerIntegrationTest : IntegrationTest() {
             "alias": "$alias"
         }"""
         var response = post("$url/contacts/add/pending", json)
-        assertEquals(200, response.statusCode)
+        assertEquals(200, response.code)
 
         val pendingContactId = response.jsonObject.getString("pendingContactId")
 
         response = post("$url/contacts/add/pending", json)
-        assertEquals(403, response.statusCode)
-        assertEquals("PENDING_EXISTS", response.jsonObject.getString("error"))
-        assertEquals(pendingContactId, response.jsonObject.getString("pendingContactId"))
-        assertEquals(alias, response.jsonObject.getString("pendingContactAlias"))
+        assertEquals(403, response.code)
+        val jsonObject = response.jsonObject
+        assertEquals("PENDING_EXISTS", jsonObject.getString("error"))
+        assertEquals(pendingContactId, jsonObject.getString("pendingContactId"))
+        assertEquals(alias, jsonObject.getString("pendingContactAlias"))
     }
 
     @Test
     fun `removing a pending contact needs authentication token`() {
         val response = deleteWithWrongToken("$url/contacts/add/pending")
-        assertEquals(401, response.statusCode)
+        assertEquals(401, response.code)
     }
 
     @Test
     fun `deleting a contact needs authentication token`() {
         val response = deleteWithWrongToken("$url/contacts/1")
-        assertEquals(401, response.statusCode)
+        assertEquals(401, response.code)
     }
 
     @Test
     fun `deleting real and non-existing contact`() {
         var response = delete("$url/contacts/1")
-        assertEquals(200, response.statusCode)
+        assertEquals(200, response.code)
 
         response = delete("$url/contacts/1")
-        assertEquals(404, response.statusCode)
+        assertEquals(404, response.code)
     }
 
 }
diff --git a/briar-headless/witness.gradle b/briar-headless/witness.gradle
index 9c7063f5cd8a9f04d08018cbb8977ff963a19f6d..2d45f588162c186875a487c9902841031b0968fd 100644
--- a/briar-headless/witness.gradle
+++ b/briar-headless/witness.gradle
@@ -16,22 +16,24 @@ dependencyVerification {
         'com.google.guava:guava:27.1-jre:guava-27.1-jre.jar:4a5aa70cc968a4d137e599ad37553e5cfeed2265e8c193476d7119036c536fe7',
         'com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava:listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar:b372a037d4230aa57fbeffdef30fd6123f9c0c2db85d0aced00c91b974f33f99',
         'com.google.j2objc:j2objc-annotations:1.1:j2objc-annotations-1.1.jar:2994a7eb78f2710bd3d3bfb639b2c94e219cedac0d4d084d516e78c16dddecf6',
+        'com.squareup.okhttp3:okhttp:4.10.0:okhttp-4.10.0.jar:7580f14fa1691206e37081ad3f92063b1603b328da0bb316f2fef02e0562e7ec',
+        'com.squareup.okio:okio-jvm:3.0.0:okio-jvm-3.0.0.jar:be64a0cc1f28ea9cd5c970dd7e7557af72c808d738c495b397bf897c9921e907',
+        'com.squareup.okio:okio:3.0.0:okio-metadata-3.0.0.jar:dcbe63ed43b2c90c325e9e6a0863e2e7605980bff5e728c6de1088be5574979e',
         'com.squareup:javapoet:1.11.1:javapoet-1.11.1.jar:9cbf2107be499ec6e95afd36b58e3ca122a24166cdd375732e51267d64058e90',
         'com.vaadin.external.google:android-json:0.0.20131108.vaadin1:android-json-0.0.20131108.vaadin1.jar:dfb7bae2f404cfe0b72b4d23944698cb716b7665171812a0a4d0f5926c0fac79',
         'io.javalin:javalin:3.5.0:javalin-3.5.0.jar:6618f99ad4c241eefcaf3a02c85adc52ec346c9710e8eb5a3f1a916e3d7acec4',
-        'io.mockk:mockk-agent-api:1.10.4:mockk-agent-api-1.10.4.jar:8deb59189b48d5870a746f954ca681424040544812c7ae295f3bef87a9499cfe',
-        'io.mockk:mockk-agent-common:1.10.4:mockk-agent-common-1.10.4.jar:13b81a3297a3c15ed9f62b838aaede20347018f07c30cad2ca74a4dd99786f8f',
-        'io.mockk:mockk-agent-jvm:1.10.4:mockk-agent-jvm-1.10.4.jar:51eb22de58c44f140384e61878e8c0da0fcf80c60a139d28ef7b027ea4bc2042',
-        'io.mockk:mockk-common:1.10.4:mockk-common-1.10.4.jar:aaf3cc99442100767dc72776f250113f992facfb43bf6ba9a5282d1c8aaecd00',
-        'io.mockk:mockk-dsl-jvm:1.10.4:mockk-dsl-jvm-1.10.4.jar:2432e2d0dfd31c3cb33e12137b8c712358cb0c4cddbd27b5bd6c55db2068e1a1',
-        'io.mockk:mockk-dsl:1.10.4:mockk-dsl-1.10.4.jar:b97d750bebfd7da92a020f5417deface710c58802a78a8fff68661f77eaa3037',
-        'io.mockk:mockk:1.10.4:mockk-1.10.4.jar:e26d4eb8c9c0c5ac00acb9bfeedfe0feb10055bf7e80db57539936413ea38f7c',
+        'io.mockk:mockk-agent-api:1.12.4:mockk-agent-api-1.12.4.jar:6eb3407b1f88c0c0ced9636f82874100786b74b3b06c4354c4d85229779fdec8',
+        'io.mockk:mockk-agent-common:1.12.4:mockk-agent-common-1.12.4.jar:427d071ec7a85f105c152a51a89738d8ee52954130e5c09500837dfbe3549329',
+        'io.mockk:mockk-agent-jvm:1.12.4:mockk-agent-jvm-1.12.4.jar:840c11f2e0a14d35e229c2b6018273f4623c7f619ebf9701164bb9c2db99c098',
+        'io.mockk:mockk-common:1.12.4:mockk-common-1.12.4.jar:16f1ba4738535458cb91fa1a759794f6618a6f9f1ae1d149e79b48cc06ea5e7b',
+        'io.mockk:mockk-dsl-jvm:1.12.4:mockk-dsl-jvm-1.12.4.jar:faee4b52def68fa182f89d23c2a45f2246ef88b6b1ba98346aa85f57e5ed630f',
+        'io.mockk:mockk-dsl:1.12.4:mockk-dsl-1.12.4.jar:7fc96f9ed5118c915a3890ba2e4090c9b283ae7bdc37ab83885415bdf77650e4',
+        'io.mockk:mockk:1.12.4:mockk-1.12.4.jar:2c34a3690b958a3cf38b82d0f4910dc9992fb078dce6f56d71498293557bf805',
         'javax.annotation:jsr250-api:1.0:jsr250-api-1.0.jar:a1a922d0d9b6d183ed3800dfac01d1e1eb159f0e8c6f94736931c1def54a941f',
         'javax.inject:javax.inject:1:javax.inject-1.jar:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
         'javax.servlet:javax.servlet-api:3.1.0:javax.servlet-api-3.1.0.jar:af456b2dd41c4e82cf54f3e743bc678973d9fe35bd4d3071fa05c7e5333b8482',
-        'khttp:khttp:0.1.0:khttp-0.1.0.jar:48ab3bd22e461f2c2e74e3446d8f9568e24aab157f61fdc85ded6c0bfbe9a926',
-        'net.bytebuddy:byte-buddy-agent:1.10.14:byte-buddy-agent-1.10.14.jar:30272167eceb1cb68fa84730a12d1abfd1daed6ae0c19fdefee47a9a9a0cfd33',
-        'net.bytebuddy:byte-buddy:1.10.14:byte-buddy-1.10.14.jar:0e6b935bfcb3e451d525956acad53ec86ff916d714abdbd32b3d2039771896f8',
+        'net.bytebuddy:byte-buddy-agent:1.12.6:byte-buddy-agent-1.12.6.jar:9b29421fe4650b75fc3ed53590f914c54f932e334b3506cc00296dff73024183',
+        'net.bytebuddy:byte-buddy:1.12.6:byte-buddy-1.12.6.jar:211918dc24f0fdef4335ce8af40ef5616e15e818b962a21146397c7701eb75a7',
         'net.java.dev.jna:jna:5.6.0:jna-5.6.0.jar:5557e235a8aa2f9766d5dc609d67948f2a8832c2d796cea9ef1d6cbe0b3b7eaf',
         'net.ltgt.gradle.incap:incap:0.2:incap-0.2.jar:b625b9806b0f1e4bc7a2e3457119488de3cd57ea20feedd513db070a573a4ffd',
         'org.apiguardian:apiguardian-api:1.1.0:apiguardian-api-1.1.0.jar:a9aae9ff8ae3e17a2a18f79175e82b16267c246fbbd3ca9dfbbb290b08dcfdd4',
@@ -57,7 +59,7 @@ dependencyVerification {
         'org.jetbrains.kotlin:kotlin-compiler-embeddable:1.7.10:kotlin-compiler-embeddable-1.7.10.jar:470ba8941794f818a34b0a8f387ee27e44268e95a108322d18d9749ae345e22b',
         'org.jetbrains.kotlin:kotlin-daemon-embeddable:1.7.10:kotlin-daemon-embeddable-1.7.10.jar:77c5f3ab1ed653a899e96835937a9daf3a46e496fdfa6915ff6d20b2953619a4',
         'org.jetbrains.kotlin:kotlin-klib-commonizer-embeddable:1.7.10:kotlin-klib-commonizer-embeddable-1.7.10.jar:1c2550f1e7ec4d1590aacddd7852b90a4cf05de6e66cee31ad747c8dc0834e33',
-        'org.jetbrains.kotlin:kotlin-reflect:1.4.20:kotlin-reflect-1.4.20.jar:3b7c82def79fb96c4579d40a47e37dec872f9f8209ee0da3ce828c39dba612e1',
+        'org.jetbrains.kotlin:kotlin-reflect:1.6.0:kotlin-reflect-1.6.0.jar:c6161884209221db7f5ddb031bb480a3c46bb90d5b65d7cc0167b149aaa9c494',
         'org.jetbrains.kotlin:kotlin-reflect:1.7.10:kotlin-reflect-1.7.10.jar:187c5e5a588a6ed18c3a41b54df138a5944121bdb396be1c3fa4abee67397955',
         'org.jetbrains.kotlin:kotlin-script-runtime:1.7.10:kotlin-script-runtime-1.7.10.jar:84bfc2aa4eec6768113930cdaef8b5b9f59ac4138fbca3b11300fff4d076950c',
         'org.jetbrains.kotlin:kotlin-scripting-common:1.7.10:kotlin-scripting-common-1.7.10.jar:c3a346f38a3d6e242f2316c5a7a4a6b526f2cc42b44ebd40654a0f885cbc4940',
@@ -69,13 +71,12 @@ dependencyVerification {
         'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.7.10:kotlin-stdlib-jdk8-1.7.10.jar:8aafdd60c94f454c92e5066d266a5ed53ecc63c78f623b3fd9db56fea4032873',
         'org.jetbrains.kotlin:kotlin-stdlib:1.7.10:kotlin-stdlib-1.7.10.jar:e771fe74250a943e8f6346713201ff1d8cb95c3a5d1a91a22b65a9e04f6a8901',
         'org.jetbrains:annotations:13.0:annotations-13.0.jar:ace2a10dc8e2d5fd34925ecac03e4988b2c0f851650c94b8cef49ba1bd111478',
-        'org.json:json:20150729:json-20150729.jar:38c21b9c3d6d24919cd15d027d20afab0a019ac9205f7ed9083b32bdd42a2353',
         'org.junit.jupiter:junit-jupiter-api:5.5.2:junit-jupiter-api-5.5.2.jar:249a2fdbd3931987c0298d00ca08ed248496e0fc11e0463c08c4f82e0cc79b1c',
         'org.junit.jupiter:junit-jupiter-engine:5.5.2:junit-jupiter-engine-5.5.2.jar:6d777da9876e2ef7a0336e8f098f8d74a5a64f810aa3a4a2f5f3b766ce97837b',
         'org.junit.jupiter:junit-jupiter-params:5.5.2:junit-jupiter-params-5.5.2.jar:fd49c7fd9d0f7f1e5b5f6982254cee79177fa2e76a37fdee0466e64f975567b5',
         'org.junit.platform:junit-platform-commons:1.5.2:junit-platform-commons-1.5.2.jar:fc44afdfc0f20c85e71a66e7943281aef3bc1e0fd62d2d69a36cb6901e682c10',
         'org.junit.platform:junit-platform-engine:1.5.2:junit-platform-engine-1.5.2.jar:ff20ba4ad8c00ef17baef9c55512f9c02d9a68740f7f1ac01a9a6aa0239931f8',
-        'org.objenesis:objenesis:3.1:objenesis-3.1.jar:cdb3d038c188de6f46ffd5cd930be2d5e5dba59c53b26437995d534e3db2fb80',
+        'org.objenesis:objenesis:3.2:objenesis-3.2.jar:03d960bd5aef03c653eb000413ada15eb77cdd2b8e4448886edf5692805e35f3',
         'org.opentest4j:opentest4j:1.2.0:opentest4j-1.2.0.jar:58812de60898d976fb81ef3b62da05c6604c18fd4a249f5044282479fc286af2',
         'org.skyscreamer:jsonassert:1.5.0:jsonassert-1.5.0.jar:a310bc79c3f4744e2b2e993702fcebaf3696fec0063643ffdc6b49a8fb03ef39',
         'org.slf4j:slf4j-api:1.7.30:slf4j-api-1.7.30.jar:cdba07964d1bb40a0761485c6b1e8c2f8fd9eb1d19c53928ac0d7f9510105c57',
diff --git a/build.gradle b/build.gradle
index 934440d3b601aa9ff7f6dc22c4f80d47ec17c0ad..a009d347bae3be26f868edf253f447b0b8c47b61 100644
--- a/build.gradle
+++ b/build.gradle
@@ -3,7 +3,6 @@
 allprojects {
 	repositories {
 		mavenCentral()
-		jcenter()
 		mavenLocal()
 		google()
 		maven { url "https://jitpack.io" }
@@ -20,7 +19,6 @@ allprojects {
 
 buildscript {
 	repositories {
-		jcenter()
 		mavenLocal()
 		google()
 		maven {