Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires larastan/larastan ^2.0 -> satisfiable by larastan/larastan[2.0.0, ..., 2.x-dev]. - Root composer.json requires laravel/framework 12.* -> satisfiable by laravel/framework[12.x-dev (alias of dev-master)]. - larastan/larastan[2.0.0, ..., 2.3.5] require illuminate/support ^9 -> found illuminate/support[v9.0.0-beta.1, ..., 9.x-dev] but it conflicts with your root composer.json require (^11.0|^12.0). - larastan/larastan[2.4.0, ..., v2.6.4] require illuminate/support ^9.47.0 || ^10.0.0 -> found illuminate/support[v9.47.0, ..., 9.x-dev, v10.0.0, ..., 10.x-dev] but it conflicts with your root composer.json require (^11.0|^12.0). - larastan/larastan[v2.6.5, ..., v2.7.0] require illuminate/support ^9.52.16 || ^10.28.0 -> found illuminate/support[v9.52.16, 9.x-dev, v10.28.0, ..., 10.x-dev] but it conflicts with your root composer.json require (^11.0|^12.0). - larastan/larastan[v2.9.9, ..., 2.x-dev] require illuminate/support ^9.52.16 || ^10.28.0 || ^11.16 -> satisfiable by illuminate/support[v11.16.0, ..., 11.x-dev]. - larastan/larastan[v2.8.0, ..., v2.9.8] require illuminate/support ^9.52.16 || ^10.28.0 || ^11.0 -> satisfiable by illuminate/support[v11.0.0, ..., 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)