diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a6b5b8b..3fd83fa 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,7 +21,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.3'
+          ruby-version: '3.1'
 
       - name: Bundler
         run: bundle install