diff --git a/.github/workflows/rails.yml b/.github/workflows/rails.yml
index 7636a9d..a474708 100644
--- a/.github/workflows/rails.yml
+++ b/.github/workflows/rails.yml
@@ -30,7 +30,7 @@ jobs:
       env:
         RAILS_ENV: test
       run: |
-        gem install bundler
+        gem install bundler -v 2.4.21
         bundle config path vendor/bundle
         bundle install --jobs 4 --retry 3
         RUBYOPT=-W0 bundle exec rake db:create