Heroku provides an opinionated platform in order to help you build better applications. We give you a default version of Ruby to get you started, and give you a way to declare your version for total control. In the past creating an application would give you 1.9.2, starting today the default is 2.0.0.
Ruby 2.0.0 is fast, stable, and works out of the box with Rails 4. Applications running on 2.0.0 will have a longer shelf life than 1.9.3, giving you greater erosion resistance.
If you have a previously deployed app it will continue to use Ruby 1.9.2, any new applications will run on 2.0.0. Heroku is an erosion resistant platform, which means we will not change a major or...Read more →