diff --git a/KotlinCore/build.gradle.kts b/KotlinCore/build.gradle.kts
index 218ff905..88d6511c 100644
--- a/KotlinCore/build.gradle.kts
+++ b/KotlinCore/build.gradle.kts
@@ -40,8 +40,8 @@ tasks.shadowJar {
 }
 
 java {
-    sourceCompatibility = JavaVersion.VERSION_11
-    targetCompatibility = JavaVersion.VERSION_11
+    sourceCompatibility = JavaVersion.VERSION_21
+    targetCompatibility = JavaVersion.VERSION_21
 }
 
 sourceSets {