A Rails 8 Upgrade Story: Building Momentum -- Planet Argon Blog

If you have a Rails app, 5+ years old, it can start to feel like a ticking time bomb. When you log into the codebase and see outdated gems, warnings, and features that were written by developers who left long ago, you might start thinking: “We’re too far behind. Maybe we should just rebuild from scratch.” It’s a common reaction, but rewrites often end up being more expensive, more disruptive, and slower to deliver results than they expected. Also, legacy apps still hold the heart of your business—core logic, customer data, integrations, and workflows that deserve care, not replacement.