diff --git a/build.gradle b/build.gradle
index f5d9a5c..077f91f 100644
--- a/build.gradle
+++ b/build.gradle
@@ -10,7 +10,7 @@ version = '0.0.1-SNAPSHOT'
 
 java {
     toolchain {
-        languageVersion = JavaLanguageVersion.of(17)
+        languageVersion = JavaLanguageVersion.of(21)
     }
 }