Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit 12.0.2 -> satisfiable by phpunit/phpunit[12.0.2]. - phpunit/phpunit 12.0.2 requires php >=8.3 -> your php version (7.4.33) does not satisfy that requirement. Problem 2 - Root composer.json requires orchestra/testbench 5.* -> satisfiable by orchestra/testbench[v5.0.0, ..., 5.x-dev]. - orchestra/testbench[v5.0.0, ..., v5.17.1] require phpunit/phpunit ^8.4 || ^9.0 -> found phpunit/phpunit[8.4.0, ..., 8.5.x-dev, 9.0.0, ..., 9.6.x-dev] but it conflicts with your root composer.json require (12.0.2). - orchestra/testbench[v5.18.0, ..., 5.x-dev] require phpunit/phpunit ^8.4 || ^9.3.3 -> found phpunit/phpunit[8.4.0, ..., 8.5.x-dev, 9.3.3, ..., 9.6.x-dev] but it conflicts with your root composer.json require (12.0.2).