Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit >=10.0 -> satisfiable by phpunit/phpunit[10.0.0, ..., 10.5.45, 11.0.0, ..., 11.5.12, 12.0.0, ..., 12.0.7]. - phpunit/phpunit[10.0.0, ..., 10.5.45] require php >=8.1 -> your php version (8.0.30) does not satisfy that requirement. - phpunit/phpunit[11.0.0, ..., 11.5.12] require php >=8.2 -> your php version (8.0.30) does not satisfy that requirement. - phpunit/phpunit[12.0.0, ..., 12.0.7] require php >=8.3 -> your php version (8.0.30) does not satisfy that requirement.