How to Run Multiple Versions of Rails on Heroku

Imagine having the ability to deploy the next version of Rails in a dual booted application on your Heroku staging server or review app before deploying it to production. This capability can help you avoid bugs and downtime in your live environment. In this blog post, we will guide you on how to deploy a Rails upgrade to a staging environment, allowing you to thoroughly test it before it goes live.At FastRuby.io, we excel at upgrading Rails applications with minimal downtime and surprises. The key to our approach is a method known as dual booting, a subject we have delved into in detail in a previous blog post opens a new window. By making minor changes to your Gemfile, you gain the ability to run a different version of Rails. This empowers you to identify and address compatibility issues proactively.