diff --git a/build.gradle b/build.gradle
index 5ab672f..2ff2c08 100644
--- a/build.gradle
+++ b/build.gradle
@@ -49,7 +49,7 @@ subprojects {
 
 javaVersions {
     libraryTarget = 11
-    runtime = 17
+    runtime = 21
 }
 
 jdks {