Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires orchestra/testbench 9.0 (exact version match: 9.0, 9.0.0 or 9.0.0.0), found orchestra/testbench[v2.0.0, ..., v2.2.1, v3.0.0, ..., 3.9.x-dev, v4.0.0, ..., 4.x-dev, v5.0.0, ..., 5.x-dev, v6.0.0, ..., 6.x-dev, v7.0.0, ..., 7.x-dev, v8.0.0, ..., 8.x-dev, 9.x-dev] but it does not match the constraint. Problem 2 - laravel/framework dev-master requires nesbot/carbon ^2.72.2|^3.0 -> found nesbot/carbon[dev-master, 2.72.2, 2.72.3, 2.x-dev, 3.0.0-beta.1, ..., 3.x-dev (alias of dev-master)] but it conflicts with your root composer.json require (2.64.1). - laravel/framework 11.x-dev is an alias of laravel/framework dev-master and thus requires it to be installed too. - Root composer.json requires laravel/framework 11.* -> satisfiable by laravel/framework[11.x-dev (alias of dev-master)].