diff --git a/build.gradle b/build.gradle
index 7e904db..cea28e8 100644
--- a/build.gradle
+++ b/build.gradle
@@ -9,7 +9,7 @@ version = '0.0.1-SNAPSHOT'
 
 java {
 	toolchain {
-		languageVersion = JavaLanguageVersion.of(22)
+		languageVersion = JavaLanguageVersion.of(21)
 	}
 }