diff --git a/.github/workflows/test-ghpages.yml b/.github/workflows/test-ghpages.yml
index a5f00ec..fde5115 100644
--- a/.github/workflows/test-ghpages.yml
+++ b/.github/workflows/test-ghpages.yml
@@ -21,7 +21,7 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           # Use the version as per https://pages.github.com/versions/.
-          ruby-version: 2.7.3
+          ruby-version: 3.3.4
           bundler-cache: true
 
       - name: Test building the GH Pages site