diff --git a/backend/build.gradle.kts b/backend/build.gradle.kts
index 0047b5f..5fcbc77 100644
--- a/backend/build.gradle.kts
+++ b/backend/build.gradle.kts
@@ -32,7 +32,7 @@ sourceSets {
 group = "com.zl.mjga"
 version = "1.0.0"
 description = "make java great again!"
-java.sourceCompatibility = JavaVersion.VERSION_17
+java.sourceCompatibility = JavaVersion.VERSION_21
 
 configurations {
     compileOnly {