diff --git a/appKotlinJvm/build.gradle.kts b/appKotlinJvm/build.gradle.kts
index fe608b5..3f42da7 100644
--- a/appKotlinJvm/build.gradle.kts
+++ b/appKotlinJvm/build.gradle.kts
@@ -21,7 +21,7 @@ dependencies {
 
 java {
 	toolchain {
-		languageVersion = JavaLanguageVersion.of(21)
+		languageVersion = JavaLanguageVersion.of(11)
 	}
 }