Which version of gem to use in semantic versioning?

Question

Lets say you're using the Devise gem. Which version of the following should you use in your Gemfile:

'devise', '~> 3.5.1'

OR

'devise', '~> 3.5'

What are the pros and cons of using one over the other?

According to RubyGems:

PATCH 0.0.x level changes for implementation level detail changes, such as small bug fixes

MINOR 0.x.0 level changes for any backwards compatible API changes, such as new functionality/features

MAJOR x.0.0 level changes for backwards incompatible API changes, such as changes that will break existing users code if they update

Wouldn't then it make sense to use 'devise', '~> 3.5' as those will get small bug fixes once bundle update is ran?

Answer 1

I think that you should use the full version number in Rails applications (or at least include your Gemfile.lock), and the other minor version number in libraries / rails engines.

I'm interpreting Gem Versioning and Bundler: Doing it Right by Yehuda Katz here. I might be wrong, but I'm doing it and works well so far.