diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index c126237..607038c 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@161cd54b698f1fb3ea539faab2e036d409550e3c # v1.187.0
+        uses: ruby/setup-ruby@50ba3386b050ad5b97a41fcb81240cbee1d1821f # v1.188.0
         with:
           ruby-version: '3.1'
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically