diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cf3b482..19ae425 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,10 +6,10 @@ jobs:
       fail-fast: false
       matrix:
         # Due to https://github.com/actions/runner/issues/849, we have to use quotes for '3.0'
-        ruby: [2.5, 2.6, 2.7, '3.0', 3.1, 3.2, head, jruby, jruby-head]
+        ruby: [2.5, 2.6, 2.7, '3.0', 3.1, 3.2, 3.3, head, jruby, jruby-head]
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby }}