diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index b49c0cc..0f826fb 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -20,7 +20,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu, macos]
-        ruby: ['2.7', '3.0', '3.1', '3.2', head, debug]
+        ruby: ['2.7', '3.0', '3.1', '3.2', '3.3', '3.4', head, debug]
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby