diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b339ad2f..61524b5b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,6 +20,7 @@ jobs:
         java: 
           - 11
           - 17
+          - 21
     name: Build and Test
     runs-on: ubuntu-latest
     container:
@@ -55,6 +56,7 @@ jobs:
         java: 
           - 11
           - 17
+          - 21
     name: Build and Test
     runs-on: windows-latest