There must be 1000s of Ruby on Rails apps still running on version 5, 6, 6.1, 7, 7.1, etc. Upgrading your Rails 5 app to version 8 is a herculean task. My latest article on how to upgrade your non-8-version Ruby on Rails application to version 8 provides a detailed guide you can follow to make this process less herculean. Read it here - Rails 8 Upgrade Guide 2025: Step-by-Step Instructions for a Smooth Transition.