diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index cc2993d9..242b47cf 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -20,7 +20,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu, macos]
-        ruby: [2.5, 2.6, 2.7, '3.0', 3.1, 3.2, head, debug]
+        ruby: [2.5, 2.6, 2.7, '3.0', 3.1, 3.2, 3.3, head, debug]
     steps:
     - uses: actions/checkout@v3
     - name: Set up Ruby