diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 736a7b7c..7e2c92b6 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -5,7 +5,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ['2.6', '2.7', '3.0', '3.1', '3.2', 'head']
+        ruby: ['2.6', '2.7', '3.0', '3.1', '3.2', '3.3', 'head']
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2