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Rails 8.0 stops getting security patches on November 7, 2026. Here is what changes between 8.0 and 8.1, the seven new defaults and which ones can bite, and a dual-boot plan you can finish before the deadline.
Ruby 4.0 is the first major version bump in over a decade, but most of the work is under the hood. Here is what actually breaks when moving a Rails app from 3.4.4 to 4.0.3, what you gain, and a phased upgrade plan you can run in a week.
A start-to-finish walkthrough of shipping a Rails 8 app with Vite, Solid Queue and PostgreSQL to a single Ubuntu VPS using Kamal 2 and Docker Hub, including the errors you will probably hit and how to fix each one.