.circleci/config.yml in deimos-ruby-1.6.4 vs .circleci/config.yml in deimos-ruby-1.7.0.pre.beta1

@@ -19,10 +19,13 @@
 
       # Bundle install dependencies in /tmp/
       # so Dockerfile does not copy them since
       # its base image is different than CircleCI
       - run:
+          name: Install bundler
+          command: gem install bundler:2.1.4
+      - run:
           name: Bundle install
           command: bundle install --path vendor/bundle --jobs=4 --retry=3
 
       # Store bundle cache
       - save_cache:
@@ -39,18 +42,24 @@
     <<: *defaults
     steps:
       - attach_workspace:
           at: ~/workspace
       - run:
+          name: Install bundler
+          command: gem install bundler:2.1.4
+      - run:
            name: Point bundle to vendor/bundle
            command: bundle --path vendor/bundle
       - run: bundle exec rubocop --display-only-fail-level-offenses --fail-level C
 
   test-rspec:
     <<: *defaults
     steps:
       - attach_workspace:
           at: ~/workspace
+      - run:
+          name: Install bundler
+          command: gem install bundler:2.1.4
       - run:
            name: Point bundle to vendor/bundle
            command: bundle --path vendor/bundle
       - run: mkdir result
       - run: