Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires laravel/framework 10.* -> satisfiable by laravel/framework[v10.0.0, ..., 10.x-dev]. - Root composer.json requires worksome/coding-style dev-feature/phpstan-2.x -> satisfiable by worksome/coding-style[dev-feature/phpstan-2.x]. - canvural/larastan-strict-rules 3.x-dev requires larastan/larastan ^3.0 -> satisfiable by larastan/larastan[v3.0.0, v3.0.1, v3.0.2, 3.x-dev]. - larastan/larastan[v3.0.0, ..., 3.x-dev] require illuminate/contracts ^11.15.0 -> satisfiable by illuminate/contracts[v11.15.0, ..., 11.x-dev]. - worksome/coding-style dev-feature/phpstan-2.x requires canvural/larastan-strict-rules 3.x-dev -> satisfiable by canvural/larastan-strict-rules[3.x-dev]. - Conclusion: don't install illuminate/contracts v11.15.0 (conflict analysis result)