Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires orchestra/testbench 9.* -> satisfiable by orchestra/testbench[9.x-dev]. - orchestra/testbench 9.x-dev requires phpunit/phpunit ^10.5 || ^11.0.1 -> found phpunit/phpunit[dev-main, 10.5.0, ..., 10.5.x-dev, 11.0.1, ..., 11.1.x-dev (alias of dev-main)] but it conflicts with your root composer.json require (^9.5).