diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 344d3f0..1ca1805 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -7,10 +7,10 @@ jobs:
   validate:
     strategy:
       matrix:
-        ruby-version: ["3.1", "3.2", "3.3", "3.4"]
+        ruby-version: ["3.1", "3.2", "3.3", "3.4", "4.0"]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with: