diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1a50cb5..250e523 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -7,7 +7,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest] # macOS-latest, windows-latest]
-        java-version: ["8", "11", "17"]
+        java-version: ["8", "11", "17", "21"]
         clojure-version: ["1.10.3", "1.11.1"]
     runs-on: ${{ matrix.os }}
     steps: