A new Rails version is about to be released and it’s coming with many changes, deprecations, and new features. Lets take a look at what you need to do to get your app ready for Rails 4. The Path to Upgrade The easiest way to be ready for Rails 4 is having your app on Rails 3.2. If you are not in 3.2, upgrading should be done by minor versions. That is from 3.0 to 3.1, and then from 3.1 to 3.2. Dep