diff --git a/starter/build.gradle b/starter/build.gradle
index b6d199c..d6f7fbf 100644
--- a/starter/build.gradle
+++ b/starter/build.gradle
@@ -5,7 +5,7 @@ plugins {
 
 java {
     toolchain {
-        languageVersion = JavaLanguageVersion.of(17)
+        languageVersion = JavaLanguageVersion.of(21)
     }
 }