Gem compatibility and Ruby version

Question

How to find out which gems need to be updated in a Rails app if the Ruby version is upgraded?

For example, I would like to know which of my Rails app gems will have to be upgraded if I upgrade my Ruby from 2.1.3 to 2.2.2. The preference would be to keep the changes minimal as to reduce the probability of things breaking.

The important thing would be for this to be a dry-run. So that one can assess the amount of work that an upgrade will require.

I have checked bundle and gem readme's without much luck.

Answer 1

If you update your rails version, it should install or resolve the required dependencies needed to run the new rails version. As far as as the gems you have entered that are NOT dependencys to Rails, you can check gem compatibility on rubygems.org. Just type in the title of your gem in the search bar.