circle.yml in url_canonicalize-0.1.5 vs circle.yml in url_canonicalize-0.1.9

@@ -1,15 +1,13 @@
 machine:
   ruby:
-    version: 2.1.9
-
+    version: 2.4.0
 dependencies:
   pre:
     - echo "export rvm_ignore_gemsets_flag=1" >> ~/.rvmrc
     - gem install bundler
   override:
     - bundle check --path=vendor/bundle || bundle install --path=vendor/bundle --jobs=4 --retry=3 --full-index
-
 test:
   override:
     - bundle exec rspec:
         timeout: 600
         parallel: true