Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit 11.4.2 -> satisfiable by phpunit/phpunit[11.4.2]. - phpunit/phpunit 11.4.2 requires php >=8.2 -> your php version (8.1.30) does not satisfy that requirement. Problem 2 - Root composer.json requires orchestra/testbench ^8.0 -> satisfiable by orchestra/testbench[v8.0.0, ..., 8.x-dev]. - orchestra/testbench[v8.0.0, ..., v8.3.1] require phpunit/phpunit ^9.6 || ^10.0.7 -> found phpunit/phpunit[9.6.0, ..., 9.6.x-dev, 10.0.7, ..., 10.5.x-dev] but it conflicts with your root composer.json require (11.4.2). - orchestra/testbench[v8.4.0, ..., 8.x-dev] require phpunit/phpunit ^9.6 || ^10.1 -> found phpunit/phpunit[9.6.0, ..., 9.6.x-dev, 10.1.0, ..., 10.5.x-dev] but it conflicts with your root composer.json require (11.4.2).