Only in Gemfile.lock. If you've hard-coded a version in Gemfile, you'll need to update it. Eg. These will update fine: gem "rails" gem "rails", "~> 3.

Only in Gemfile.lock. If you've hard-coded a version in Gemfile, you'll need to update it. Eg. These will update fine: gem "rails" gem "rails", "~> 3.2" This wont: gem "rails", "= 3.2.10"