Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires laravel/framework 13.* -> satisfiable by laravel/framework[13.0.x-dev (alias of dev-master), ..., 13.x-dev]. - laravel/framework[dev-master, 13.0.x-dev, ..., 13.x-dev] require guzzlehttp/guzzle ^7.8.2 -> found guzzlehttp/guzzle[7.8.2, ..., 7.15.x-dev] but it conflicts with your root composer.json require (^8.0). - laravel/framework 13.0.x-dev is an alias of laravel/framework dev-master and thus requires it to be installed too.