Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires symfony/yaml ^7.0 -> satisfiable by symfony/yaml[v7.0.0-BETA1, ..., 7.1.x-dev]. - symfony/yaml[v7.0.0-BETA1, ..., 7.1.x-dev] require php >=8.2 -> your php version (8.1.28) does not satisfy that requirement. Problem 2 - orchestra/testbench[v8.0.0, ..., 8.x-dev] require symfony/yaml ^6.2 -> found symfony/yaml[v6.2.0-BETA1, ..., 6.4.x-dev] but it conflicts with your root composer.json require (^7.0). - Root composer.json requires orchestra/testbench 8.* -> satisfiable by orchestra/testbench[v8.0.0, ..., 8.x-dev].