Fix JPS build
diff --git a/jps/jps-plugin/build.gradle.kts b/jps/jps-plugin/build.gradle.kts
index 2f9dc67..f2ccfdd 100644
--- a/jps/jps-plugin/build.gradle.kts
+++ b/jps/jps-plugin/build.gradle.kts
@@ -9,7 +9,7 @@
 val generateTests by generator("org.jetbrains.kotlin.jps.GenerateJpsPluginTestsKt") {
     javaLauncher.set(
         javaToolchains.launcherFor {
-            languageVersion.set(JavaLanguageVersion.of(11))
+            languageVersion.set(JavaLanguageVersion.of(8))
         }
     )
 }
@@ -94,7 +94,7 @@
 
 java {
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(11))
+        languageVersion.set(JavaLanguageVersion.of(8))
     }
 }