Each major release of Rails brings shiny new features and mild headaches for developers required to upgrade their applications and gems. Rails API, ActionCable, Turbolinks 3 are only a few of the changes announced for Rails 5. How can programmers get ready for the future without breaking their legacy code? In this talk, I will cover the improvements brought by Rails 5, explain the Core team’s motivations behind each feature, and illustrate the upgrade process to smoothly transition gems and apps from Rails 4.2 to Rails 5.0.