Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires larastan/larastan ^3.0 -> satisfiable by larastan/larastan[v3.0.0, ..., 3.x-dev]. - Root composer.json requires laravel/framework 12.* -> satisfiable by laravel/framework[12.x-dev (alias of dev-master)]. - larastan/larastan[v3.0.0, ..., 3.x-dev] require illuminate/support ^11.15.0 -> satisfiable by illuminate/support[v11.15.0, ..., 11.x-dev]. - Conclusion: don't install illuminate/support v11.33.2 (conflict analysis result) - Conclusion: don't install illuminate/support v11.41.0 (conflict analysis result) - Conclusion: don't install illuminate/support v11.43.0 (conflict analysis result)