diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bd35c5c..26af1ab 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -33,7 +33,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [ '2.6', '2.7', '3.0', '3.1', '3.2' ]
+        ruby: [ '2.6', '2.7', '3.0', '3.1', '3.2', '3.3' ]
 
     steps:
       - uses: actions/checkout@v4