Will my application break after the Laravel upgrade?

Not if the upgrade is done properly. Every Laravel upgrade we ship includes a regression test pass on Pest or PHPUnit, manual QA on critical user journeys, performance verification at expected production traffic, and a rollback plan ready before cutover. If your application has no test coverage today, we typically write critical path tests as part of the upgrade engagement, because shipping a major version change without tests is genuinely risky. Post upgrade monitoring through Pulse and Sentry catches anything that slipped through QA.