Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires pestphp/pest-plugin-laravel ^4.0 -> satisfiable by pestphp/pest-plugin-laravel[v4.0.0, 4.x-dev]. - pestphp/pest-plugin-laravel[v4.0.0, ..., 4.x-dev] require php ^8.3.0 -> your php version (8.1.34) does not satisfy that requirement. Problem 2 - Root composer.json requires larastan/larastan ^3.0 -> satisfiable by larastan/larastan[v3.0.0, ..., 3.x-dev]. - larastan/larastan[v3.0.0, ..., 3.x-dev] require php ^8.2 -> your php version (8.1.34) does not satisfy that requirement.