Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^11.4 -> satisfiable by phpunit/phpunit[11.4.0]. - phpunit/phpunit 11.4.0 requires php >=8.2 -> your php version (8.1.30) does not satisfy that requirement. Problem 2 - Root composer.json requires phpspec/prophecy-phpunit ^2.2 -> satisfiable by phpspec/prophecy-phpunit[v2.2.0]. - phpspec/prophecy-phpunit v2.2.0 requires phpunit/phpunit ^9.1 || ^10.1 || ^11.0 -> satisfiable by phpunit/phpunit[11.4.0]. - phpunit/phpunit 11.4.0 requires php >=8.2 -> your php version (8.1.30) does not satisfy that requirement.