diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 068f9755..5b0ac77b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -185,7 +185,7 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           bundler-cache: true
-          ruby-version: 'ruby'
+          ruby-version: 3.3.5 # 'ruby'
 
       - name: Setup git for committing
         run: |