diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/testbase/TestVersions.kt b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/testbase/TestVersions.kt
index c2d55c42b2f..664e08a8201 100644
--- a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/testbase/TestVersions.kt
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/testbase/TestVersions.kt
@@ -29,7 +29,7 @@ interface TestVersions {
     }
 
     object Kotlin {
-        const val STABLE_RELEASE = "1.5.32"
+        const val STABLE_RELEASE = "1.6.21"
 
         // Copied from KOTLIN_VERSION.kt file
         val CURRENT