diff --git a/app.briar.gtk.json b/app.briar.gtk.json
index 831bd84b3a65bc6b3b388737815ba20e5ef0310b..bd1b40806ac21c724ae8b36d266fd9fba3e0b41f 100644
--- a/app.briar.gtk.json
+++ b/app.briar.gtk.json
@@ -49,13 +49,13 @@
             "name": "python-dependencies",
             "buildsystem": "simple",
             "build-commands": [
-                "pip3 install --no-index --find-links=\"file://${PWD}\" --prefix=${FLATPAK_DEST} requests2 websockets"
+                "pip3 install --exists-action=i --no-index --find-links=\"file://${PWD}\" --prefix=${FLATPAK_DEST} \"requests2\" \"websockets\""
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@@ -64,8 +64,8 @@
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@@ -74,8 +74,8 @@
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+                    "url": "https://files.pythonhosted.org/packages/5e/c4/6c4fe722df5343c33226f0b4e0bb042e4dc13483228b4718baf286f86d87/certifi-2020.6.20-py2.py3-none-any.whl",
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@@ -113,8 +113,8 @@
             "sources": [
                 {
                     "type": "file",
-                    "url": "https://media.dorfbrunnen.eu/briar/jars/011/briar-headless.jar",
-                    "sha256": "6ddaa8dc73b184c1fa8e4d894a6e3540583899a43699858da9bf3ed3725e847c"
+                    "url": "https://media.dorfbrunnen.eu/briar/jars/012/briar-headless.jar",
+                    "sha256": "12546880a65033d5725a22705095fa053f0a3b13dc3fcf4d9e21d1d5ede9c4cf"
                 }
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@@ -122,53 +122,53 @@
 	    "name": "python3-flit",
 	    "buildsystem": "simple",
 	    "build-commands": [
-		"pip3 install --no-index --find-links=\"file://${PWD}\" --prefix=${FLATPAK_DEST} flit"
+		"pip3 install --exists-action=i --no-index --find-links=\"file://${PWD}\" --prefix=${FLATPAK_DEST} \"flit\""
 	    ],
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