diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index 1642e08..08d1a8a 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -28,7 +28,7 @@ jobs:
         with:
           fetch-depth: 0 # need full history to get page last modified times
       - name: Setup Ruby
-        uses: ruby/setup-ruby@d37167af451eb51448db3354e1057b75c4b268f7 # v1.155.0
+        uses: ruby/setup-ruby@5cfe23c062c0aac352e765b1b7cc12ea5255ccc4 # v1.156.0
         with:
           ruby-version: '3.1'
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically