diff --git a/.github/workflows/java-ci.yml b/.github/workflows/java-ci.yml
index 4062c23..a7533e3 100644
--- a/.github/workflows/java-ci.yml
+++ b/.github/workflows/java-ci.yml
@@ -13,6 +13,7 @@ jobs:
                - 8
                - 11
                - 17
+               - 21
             os:
                - ubuntu
                - windows