Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires orchestra/testbench ^6.23 -> satisfiable by orchestra/testbench[v6.23.0, ..., 6.x-dev]. - nunomaduro/larastan[2.4.0, ..., v2.6.4] require illuminate/support ^9.47.0 || ^10.0.0 -> satisfiable by illuminate/support[v9.47.0, ..., 9.x-dev, v10.0.0, ..., 10.x-dev]. - nunomaduro/larastan 2.x-dev requires illuminate/support ^9.52.16 || ^10.28.0 -> satisfiable by illuminate/support[v9.52.16, 9.x-dev, v10.28.0, 10.x-dev]. - nunomaduro/larastan[2.0.0, ..., 2.3.5] require illuminate/support ^9 -> satisfiable by illuminate/support[v9.0.0-beta.1, ..., 9.x-dev]. - Only one of these can be installed: illuminate/support[v7.0.0, ..., 7.x-dev, v8.0.0, ..., 8.x-dev, v9.0.0-beta.1, ..., 9.x-dev, v10.0.0, ..., 10.x-dev], laravel/framework[v8.0.0, ..., 8.x-dev]. laravel/framework replaces illuminate/support and thus cannot coexist with it. - Conclusion: install laravel/framework 8.x-dev (conflict analysis result) - Root composer.json requires nunomaduro/larastan ^2.0 -> satisfiable by nunomaduro/larastan[2.0.0, ..., 2.x-dev].