diff --git a/catformat-core/build.gradle b/catformat-core/build.gradle
index 0328a03..096128d 100644
--- a/catformat-core/build.gradle
+++ b/catformat-core/build.gradle
@@ -4,7 +4,7 @@ dependencies {
 
 java {
     toolchain {
-        languageVersion = JavaLanguageVersion.of(17)
+        languageVersion = JavaLanguageVersion.of(21)
     }
     withSourcesJar()
 }
\ No newline at end of file