Use Kotlin 1.5.21

build.gradle

 buildscript {
-    ext.kotlin_version = "1.4.32"
+    ext.kotlin_version = "1.5.21"
     repositories {
         google()
         jcenter()
@@ -19,4 +19,4 @@ allprojects {
 
 task clean (type: Delete) {
     delete rootProject.buildDir
-}
\ No newline at end of file
+}