diff --git a/gradle.properties b/gradle.properties
index f11e0c7341..cbc26e1257 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,7 +1,7 @@
 # Copied from kotlinc
 org.gradle.jvmargs=-Duser.country=US -Dkotlin.daemon.jvm.options=-Xmx2200m -Dfile.encoding=UTF-8
 
-kotlinBaseVersion=1.9.20-dev-4459
+kotlinBaseVersion=1.9.0
 agpBaseVersion=7.0.0
 intellijVersion=213.7172.25
 junitVersion=4.13.1
diff --git a/integration-tests/src/test/kotlin/com/google/devtools/ksp/test/PlaygroundIT.kt b/integration-tests/src/test/kotlin/com/google/devtools/ksp/test/PlaygroundIT.kt
index 3ce913497d..4928046588 100644
--- a/integration-tests/src/test/kotlin/com/google/devtools/ksp/test/PlaygroundIT.kt
+++ b/integration-tests/src/test/kotlin/com/google/devtools/ksp/test/PlaygroundIT.kt
@@ -321,7 +321,10 @@ class PlaygroundIT {
         val gradleRunner = GradleRunner.create().withProjectDir(project.root).withGradleVersion("8.0")
         gradleRunner.withArguments("clean", "build").buildAndFail().let { result ->
             Assert.assertTrue(
-                result.output.contains("Inconsistent JVM-target compatibility detected for tasks")
+                result.output.contains(
+                    "'compileJava' task (current target is 11) and 'kspKotlin' " +
+                        "task (current target is 17) jvm target compatibility should be set to the same Java version."
+                )
             )
         }
         project.restore(buildFile.path)