Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^11 -> satisfiable by phpunit/phpunit[11.0.0, 11.0.1]. - phpunit/phpunit[11.0.0, ..., 11.0.1] require php >=8.2 -> your php version (8.1.27) does not satisfy that requirement. Problem 2 - orchestra/testbench[v8.0.0, ..., v8.3.1] require phpunit/phpunit ^9.6 || ^10.0.7 -> found phpunit/phpunit[9.6.0, ..., 9.6.16, 10.0.7, ..., 10.5.9] but it conflicts with your root composer.json require (^11). - orchestra/testbench[v8.4.0, ..., v8.21.1] require phpunit/phpunit ^9.6 || ^10.1 -> found phpunit/phpunit[9.6.0, ..., 9.6.16, 10.1.0, ..., 10.5.9] but it conflicts with your root composer.json require (^11). - Root composer.json requires orchestra/testbench ^8 -> satisfiable by orchestra/testbench[v8.0.0, ..., v8.21.1].