diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b396fe2..a11b2bc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ['3.0', '3.1', '3.2', ruby-head]
+        ruby-version: ['3.0', '3.1', '3.2', '3.3', ruby-head]
 
     steps:
     - uses: actions/checkout@v4