diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0cb11d7..682fe31 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -33,6 +33,7 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{matrix.ruby}}
+          bundler-cache: true # 'bundle install' and cache gems
       - name: Install latest bundler
         run: |
           gem install bundler --no-document