diff --git a/packages/pigeon/platform_tests/test_plugin/android/build.gradle b/packages/pigeon/platform_tests/test_plugin/android/build.gradle
index e99796f6882..cf5ccf171dd 100644
--- a/packages/pigeon/platform_tests/test_plugin/android/build.gradle
+++ b/packages/pigeon/platform_tests/test_plugin/android/build.gradle
@@ -2,7 +2,7 @@ group 'com.example.test_plugin'
 version '1.0-SNAPSHOT'
 
 buildscript {
-    ext.kotlin_version = '1.8.20'
+    ext.kotlin_version = '1.8.21'
     repositories {
         google()
         mavenCentral()