.circleci/config.yml in graph_attack-1.1.0 vs .circleci/config.yml in graph_attack-1.2.0

@@ -4,33 +4,30 @@
 #
 version: 2
 jobs:
   build:
     docker:
-       - image: circleci/ruby:2.4.1-node-browsers
+       - image: circleci/ruby:2.7.3
        - image: redis
 
     working_directory: ~/repo
 
     steps:
       - checkout
 
       # Download and cache dependencies
       - restore_cache:
           keys:
-          - v1-dependencies-{{ checksum "graph_attack.gemspec" }}
-          # fallback to using the latest cache if no exact match is found
-          - v1-dependencies-
+          - v2-dependencies-{{ checksum "graph_attack.gemspec" }}
+          - v2-dependencies-
 
-      - run:
-          name: install dependencies
-          command: |
-            bundle install --jobs=4 --retry=3 --path vendor/bundle
+      - run: gem install bundler:2.0.2
+      - run: bundle install --jobs=4 --retry=3 --path vendor/bundle
 
       - save_cache:
           paths:
             - ./vendor/bundle
-          key: v1-dependencies-{{ checksum "graph_attack.gemspec" }}
+          key: v2-dependencies-{{ checksum "graph_attack.gemspec" }}
 
       # Run tests!
       - run:
           name: run tests
           command: |