diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 296c0d8..e61811d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,7 +25,8 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.image }}
+          bundler-cache: true
       - name: Run tests
         run: |
-          gem install -g
-          rake
+          bundle install
+          bundle exec rake
diff --git a/.rubocop.yml b/.rubocop.yml
index 55beb10..0818216 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -8,6 +8,7 @@ AllCops:
   TargetRubyVersion: 2.7
   Exclude:
     - 'numbers_and_words.gemspec'
+    - vendor/bundle/**/*
 
 Layout/EmptyLinesAroundAttributeAccessor:
   Enabled: true