Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit 10.5.30 -> satisfiable by phpunit/phpunit[10.5.30]. - phpunit/phpunit 10.5.30 requires php >=8.1 -> your php version (8.0.30) does not satisfy that requirement. Problem 2 - phpspec/prophecy-phpunit v2.2.0 requires phpunit/phpunit ^9.1 || ^10.1 || ^11.0 -> satisfiable by phpunit/phpunit[10.5.30]. - phpspec/prophecy-phpunit v2.1.0 requires phpunit/phpunit ^9.1 || ^10.1 -> satisfiable by phpunit/phpunit[10.5.30]. - phpspec/prophecy-phpunit v2.0.0 requires php ^7.3 -> your php version (8.0.30) 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, ..., 9.6.20] but it conflicts with your root composer.json require (10.5.30). - phpunit/phpunit 10.5.30 requires php >=8.1 -> your php version (8.0.30) does not satisfy that requirement. - Root composer.json requires phpspec/prophecy-phpunit ^2.0 -> satisfiable by phpspec/prophecy-phpunit[v2.0.0, ..., v2.2.0].