diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index ff835028f..3130b0838 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -47,7 +47,7 @@ jobs:
       uses: ruby/setup-ruby@v1
       with:
         bundler-cache: true
-        bundler: '2.5.2'
+        bundler: '2.4.22'
         ruby-version: ${{ matrix.ruby }}
     - name: Run tests
       run: bundle exec rake