# Rails 3 Upgrade A Rails 3.2.22 application that hasn't been touched since 2017, a developer named Gary who left no documentation, and a nightly job that sends data to a company in Ohio that nobody knew about. This is the upgrade project. Read the [migration plan](plan.md) for the approach, the [gem audit](gem-audit.md) for the dependency situation, and the [post-mortem](post-mortem.md) for why Sprint 1 took three weeks and the Rails version didn't change.