Build on JDK 21
diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index 04f488b..99cb8ca 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -10,7 +10,7 @@
     strategy:
       fail-fast: false
       matrix:
-        jdk: [ '11', '17', '19' ]
+        jdk: [ '11', '17', '21' ]
         dist: [ 'zulu' ]
 
     steps: