.circleci/config.yml in eligible-2.9.15 vs .circleci/config.yml in eligible-3.0.0.beta1

@@ -1,8 +1,8 @@
 version: 2
 default_environment: &default_environment
   docker:
-    - image: circleci/ruby:2.2-jessie-browsers
+    - image: circleci/ruby:2.4-stretch-browsers
       environment:
         BUNDLE_JOBS: 3
         BUNDLE_RETRY: 3
         BUNDLE_PATH: vendor/bundle
         RAILS_ENV: test