diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f06a37f..424d6ca 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,10 +21,11 @@ jobs:
           - "3.0"
           - "3.1"
           - "3.2"
+          - "3.3"
           - "jruby-9.4"
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1