diff --git a/.github/workflows/test-pull-request.yml b/.github/workflows/test-pull-request.yml
index d846371d..150e5afe 100644
--- a/.github/workflows/test-pull-request.yml
+++ b/.github/workflows/test-pull-request.yml
@@ -21,7 +21,7 @@ jobs:
         npx honkit build
 
     - name: Cache bundled gems
-      uses: actions/cache@v1
+      uses: actions/cache@v4
       with:
         path: vendor/bundle
         # We'd normally use Gemfile.lock, but nonexistent here.