Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires illuminate/contracts ^11.43|^12.0 -> satisfiable by illuminate/contracts[v11.43.0, v11.43.1, v11.43.2, 11.x-dev, 12.x-dev], laravel/framework[v11.43.0, v11.43.1, v11.43.2, 11.x-dev]. - Root composer.json requires laravel/framework 11.* -> satisfiable by laravel/framework[v11.0.0, ..., 11.x-dev]. - laravel/framework[v11.40.0, ..., 11.x-dev] require nesbot/carbon ^2.72.6|^3.8.4 -> found nesbot/carbon[dev-master, 2.72.6, 2.73.0, 2.x-dev, 3.8.4, 3.8.5, 3.8.6, 3.x-dev (alias of dev-master)] but it conflicts with your root composer.json require (3.4). - Conclusion: don't install illuminate/contracts v11.43.0 (conflict analysis result) - Only one of these can be installed: laravel/framework[v11.0.0, ..., 11.x-dev], illuminate/contracts[v11.43.0, v11.43.1, v11.43.2, 11.x-dev, 12.x-dev]. laravel/framework replaces illuminate/contracts and thus cannot coexist with it.