RailsConf 2025 Rails Framework Defaults: Defusing the Time Bomb in Your Upgraded App by Josh Puetz

Yay, you did it: you upgraded Rails and it's live in production! All done, right? Not so fast: most upgrade talks and tutorials skip over the important step of upgrading Rails framework defaults. Your Rails upgrade isn't really done until you've disarmed the time bomb of outdated defaults. It can be tricky and isn't well documented, but you can do it with these steps.