This will hopefully fix errors seen on CI and locally:
Bundler could not find compatible versions for gem "bundler":
In Gemfile:
bundler (~> 2.0.1)
Current Bundler version:
bundler (2.1.4)
This Gemfile requires a different version of Bundler.
Perhaps you need to update Bundler by running gem install bundler?
This will hopefully fix errors seen on CI and locally: