Ruby upgrade version and code compatibility checker

Question

Is there a way to upgrade the underlying Ruby version of a rails project and be certain there are no breaking changes within the code? I use rvm to maintain my Ruby environment and I know I can simply create a new environment and go from there but that would involve testing the entire application.

For example, my Gemfile specifies the following:

ruby '2.0.0'
gem 'rails', '~> 4.0.3'
gem 'rake'

If I were to upgrade to Ruby 2.4 is there any way to check my code to see if there are any breaking changes between versions?

Answer 1

Turns out if you are using bundler you can do a bundle update and it will update all the gems to the latest compatible versions. You can then do a bundle clean it will remove unused gems and finally using rvm you can update versions and test functionality.