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I followed this guideline in a project where I was upgrading from 3.2 to 4.2, and the final step from 4.1 to 4.2 was so easy that I was ready to deploy in less than 15 minutes.
Before upgrading rails, it’s a good idea to upgrade other dependencies to make sure you have compatible versions of those gems.
The files created by the application generator—config files, default asset files, and so on—can also change from version to version.
As part of the upgrade process, you generally want to update all those generated files to bring them in step with the newer versions.
But lately we've been using railsdiff.org, which makes it much easier to compare the differences between any two Rails versions.