You just finished upgrading your app to the latest Rails version and you made the decision to never stay behind and always be ready to upgrade as soon as possible… But how can you do that?

In this article Ariel explains how the Dual-Boot technique can be used to test the app against Rails’ main branch, to catch problems and warnings before a new version is released.

The benefit of this is that, by the time a new Rails version is released, our code will be already tested against it, and we can upgrade with fewer issues. Another benefit of this approach is that it allows us to encounter the problems one by one as they appear, since the scope of changes that we have to analyze to find a solution is reduced, instead of having to deal with all the changes done between releases (and problems) at the same time.

More here: How to Dual Boot with Rails’ Main Branch