.circleci/config.yml in sinatra-errorcodes-0.4.1 vs .circleci/config.yml in sinatra-errorcodes-0.4.2

@@ -1,10 +1,9 @@
 version: 2
-
 jobs:
   build:
     docker:
-      - image: circleci/ruby:2.4.4-jessie
+      - image: circleci/ruby:2.6.6
     steps:
       - checkout
       - run: bundle install
       - run: bundle exec rake spec