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[v9.0.0, ..., v9.16.0]. - orchestra/testbench[v9.0.0, ..., v9.5.2] require phpunit/phpunit ^10.5 || ^11.0.1 -> found phpunit/phpunit[10.5.0, ..., 10.5.60, 11.0.1, ..., 11.5.48] but it conflicts with your root composer.json require (^8.0). - orchestra/testbench[v9.6.0, ..., v9.11.0] require phpunit/phpunit ^10.5.35 || ^11.3.6 -> found phpunit/phpunit[10.5.35, ..., 10.5.60, 11.3.6, ..., 11.5.48] but it conflicts with your root composer.json require (^8.0). - orchestra/testbench v9.12.0 requires phpunit/phpunit ^10.5.35|^11.3.6 -> found phpunit/phpunit[10.5.35, ..., 10.5.60, 11.3.6, ..., 11.5.48] but it conflicts with your root composer.json require (^8.0). - orchestra/testbench[v9.13.0, ..., v9.16.0] require phpunit/phpunit ^10.5.35|^11.3.6|^12.0.1 -> found phpunit/phpunit[10.5.35, ..., 10.5.60, 11.3.6, ..., 11.5.48, 12.0.1, ..., 12.5.6] but it conflicts with your root composer.json require (^8.0).