circle.yml in netsuite-0.8.3 vs circle.yml in netsuite-0.8.4

@@ -1,15 +1,16 @@
 # https://leonid.shevtsov.me/post/multiple-rubies-on-circleci/
 
 machine:
   environment:
-    RUBY_VERSIONS: 2.0.0,2.1.10,2.2.5,2.3.1,2.4.0
+    RUBY_VERSIONS: 2.0.0,2.1.10,2.2.9,2.3.7,2.4.4,2.5.1,2.6.1
 
 dependencies:
   override:
+    - gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
     - rvm get head
     - rvm install $RUBY_VERSIONS
-    - rvm $RUBY_VERSIONS --verbose do gem install bundler
+    - rvm $RUBY_VERSIONS --verbose do gem install bundler -v 1.17.3
     - rvm $RUBY_VERSIONS --verbose do bundle install
 
 test:
   override:
     - rvm $RUBY_VERSIONS --verbose do bundle exec rspec spec