diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ec3a7e1..cea83c5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,18 +12,27 @@ jobs:
     steps:
     - uses: actions/checkout@master
 
-    - name: Sets up the Ruby version
+    - name: Set up the Ruby version
       uses: actions/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby }}
 
-    - name: Sets up the environment
+    - name: Ruby gem cache
+      uses: actions/cache@v1
+      with:
+        path: vendor/bundle
+        key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-gems-
+
+    - name: Set up the environment
       run: |
         gem install bundler
+        bundle config path vendor/bundle
         bundle install --jobs 4 --retry 3
 
     - name: Runs tests
-      run: rspec
+      run: bundle exec rspec
 
   rubocop:
     runs-on: ubuntu-latest
@@ -34,15 +43,24 @@ jobs:
     steps:
     - uses: actions/checkout@master
 
-    - name: Sets up the Ruby version
+    - name: Set up the Ruby version
       uses: actions/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby }}
 
-    - name: Sets up the environment
+    - name: Ruby gem cache
+      uses: actions/cache@v1
+      with:
+        path: vendor/bundle
+        key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-gems-
+
+    - name: Set up the environment
       run: |
         gem install bundler
+        bundle config path vendor/bundle
         bundle install --jobs 4 --retry 3
 
     - name: Runs Rubocop
-      run: rubocop
+      run: bundle exec rubocop