Upgrade Rails to latest version

Question

I'm new to the Ruby on Rails environment and would like to get input in relation to upgrading my Rails environment from 4.0.2 to 4.2.3, which I assume is the latest version.

My Ruby version is 2.0.0p353 (2013-11-22) [i386-mingw32].

• Is upgrading a straight-forward process? If not, what is the upgrade path I need to follow?
• I normally use bundle install cmd to install all gems. Is there a similar command to upgrade to the latest version?
• Do I need to backup my apps before I try anything?

Answer 1

In your gemfile change:

gem 'rails', '4.0.2'

to

gem 'rails', '4.2.3'

and in your terminal run bundle update.

If you are trying to update ONLY Rails, run: bundle update rails.