diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index f4d4738..a2b11f2 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@2a18b06812b0e15bb916e1df298d3e740422c47e # v1.203.0
+        uses: ruby/setup-ruby@401c19e14f474b54450cd3905bb8b86e2c8509cf # v1.204.0
         with:
           ruby-version: '3.1'
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically