diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 456d865..5ec8526 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -6,7 +6,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        ruby: ['3.0', '3.1', '3.2']
+        ruby: ['3.0', '3.1', '3.2', '3.3']
     name: test (Ruby ${{ matrix.ruby }} on ${{ matrix.os }})
     runs-on: ${{ matrix.os }}
     steps: