diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index 0835da63..9e80f692 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@d4526a55538b775af234ba4af27118ed6f8f6677 # v1.172.0
+        uses: ruby/setup-ruby@5f19ec79cedfadb78ab837f95b87734d0003c899 # v1.173.0
         with:
           ruby-version: '3.1'
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically