Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires laravel/framework 12.* -> satisfiable by laravel/framework[12.x-dev]. - laravel/framework 12.x-dev requires nesbot/carbon ^3.8.4 -> found nesbot/carbon[dev-master, 3.8.4, 3.8.5, 3.8.6, 3.x-dev (alias of dev-master)] but it conflicts with your root composer.json require (^2.62.1). Problem 2 - Root composer.json requires orchestra/testbench ^10.0 -> satisfiable by orchestra/testbench[10.0.x-dev, 10.x-dev]. - laravel/framework 12.x-dev requires nesbot/carbon ^3.8.4 -> found nesbot/carbon[dev-master, 3.8.4, 3.8.5, 3.8.6, 3.x-dev (alias of dev-master)] but it conflicts with your root composer.json require (^2.62.1). - orchestra/testbench[10.0.x-dev, ..., 10.x-dev] require laravel/framework ^12.0 -> satisfiable by laravel/framework[12.x-dev].