Updating the default version of Ruby to 2.3.x
We'd like to let you know that in the next week we'll be scheduling work to
update the default version of Ruby in the Ruby Buildpack from 2.2.x to
2.3.x. This change only affects application that don't specify the version
of Ruby in the Gemfile.
Please let us know if this is an undesired change. Also, please keep in
mind that you can always force the buildpack to use a specific version of
ruby by adding the following line to your `Gemfile`: