diff --git a/build-tools-lib/build.gradle.kts b/build-tools-lib/build.gradle.kts
index b5f2722..6ccd1d5 100644
--- a/build-tools-lib/build.gradle.kts
+++ b/build-tools-lib/build.gradle.kts
@@ -30,7 +30,7 @@ publishing {
 
 java {
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(11))
+        languageVersion.set(JavaLanguageVersion.of(8))
     }
     withSourcesJar()
 }