Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires larastan/larastan ^2.9 -> satisfiable by larastan/larastan[v2.9.0, ..., v2.9.9]. - larastan/larastan[v2.9.0, ..., v2.9.9] require php ^8.0.2 -> your php version (7.4.33) does not satisfy that requirement.