Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^11.3 -> satisfiable by phpunit/phpunit[11.3.0, 11.3.x-dev, 11.4.x-dev]. - phpunit/phpunit[11.3.0, ..., 11.4.x-dev] require php >=8.2 -> your php version (8.1.28) does not satisfy that requirement. Problem 2 - phpspec/prophecy-phpunit[v2.2.0, ..., 2.x-dev] require phpunit/phpunit ^9.1 || ^10.1 || ^11.0 -> satisfiable by phpunit/phpunit[11.3.0, 11.3.x-dev, 11.4.x-dev]. - phpspec/prophecy-phpunit v2.0.0 requires php ^7.3 -> your php version (8.1.28) does not satisfy that requirement. - phpspec/prophecy-phpunit[v2.0.1, ..., v2.0.2] require phpunit/phpunit ^9.1 -> found phpunit/phpunit[9.1.0, ..., 9.6.x-dev] but it conflicts with your root composer.json require (^11.3). - phpspec/prophecy-phpunit v2.1.0 requires phpunit/phpunit ^9.1 || ^10.1 -> found phpunit/phpunit[9.1.0, ..., 9.6.x-dev, 10.1.0, ..., 10.5.x-dev] but it conflicts with your root composer.json require (^11.3). - phpunit/phpunit[11.3.0, ..., 11.4.x-dev] require php >=8.2 -> your php version (8.1.28) does not satisfy that requirement. - Root composer.json requires phpspec/prophecy-phpunit ^2.0 -> satisfiable by phpspec/prophecy-phpunit[v2.0.0, ..., 2.x-dev].