diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index cf146ff..72938a4 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -11,7 +11,7 @@ jobs:
   test-bot:
     strategy:
       matrix:
-        os: [macos-latest]
+        os: [macos-latest, ubuntu-22.04]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Set up Homebrew
@@ -20,7 +20,7 @@ jobs:
 
       - name: Cache Homebrew Bundler RubyGems
         id: cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ${{ steps.set-up-homebrew.outputs.gems-path }}
           key: ${{ runner.os }}-rubygems-${{ steps.set-up-homebrew.outputs.gems-hash }}