diff --git a/build.gradle.kts b/build.gradle.kts
index 31fe3332..6c7c5958 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -45,6 +45,10 @@ allprojects {
             )
         }
     }
+
+    java {
+        toolchain.languageVersion.set(JavaLanguageVersion.of(21))
+    }
 }
 
 // for uber jar