diff --git a/expansion/compatibility/ProtectionStones/build.gradle.kts b/expansion/compatibility/ProtectionStones/build.gradle.kts
index 6aded763..6d4317de 100644
--- a/expansion/compatibility/ProtectionStones/build.gradle.kts
+++ b/expansion/compatibility/ProtectionStones/build.gradle.kts
@@ -1,6 +1,6 @@
 java {
-    sourceCompatibility = JavaVersion.VERSION_17
-    targetCompatibility = JavaVersion.VERSION_17
+    sourceCompatibility = JavaVersion.VERSION_21
+    targetCompatibility = JavaVersion.VERSION_21
 }
 
 repositories {