What are Laravel upgrade services?

Laravel upgrade services are the engineering work of moving a Laravel application from an older version to a newer one (for example Laravel 8 to 11, Laravel 9 to 12, or Laravel 10 to 12) while handling breaking changes, updating dependencies, fixing regressions, and verifying performance before production cutover. A proper Laravel version upgrade is not a Composer command, it is a multi week project with dependency audit, regression testing, and staged rollout that protects production from surprises.