Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires infection/infection ^0.30 -> satisfiable by infection/infection[0.30.0]. - infection/infection 0.30.0 requires nikic/php-parser ^5.3 -> found nikic/php-parser[v5.3.0, v5.3.1, v5.4.0, v5.5.0] but it conflicts with your root composer.json require (^4). Problem 2 - Root composer.json requires phpspec/phpspec ^7 -> satisfiable by phpspec/phpspec[7.0.0, ..., 7.6.0]. - phpspec/phpspec[7.0.0, ..., 7.1.0] require php ^7.3 || 8.0.* -> your php version (8.4.8) does not satisfy that requirement. - phpspec/phpspec 7.2.0 requires php ^7.3 || 8.0.* || 8.1.* -> your php version (8.4.8) does not satisfy that requirement. - phpspec/phpspec[7.3.0, ..., 7.4.0] require php ^7.3 || 8.0.* || 8.1.* || 8.2.* -> your php version (8.4.8) does not satisfy that requirement. - phpspec/phpspec[7.5.0, ..., 7.6.0] require php ^7.3 || 8.0.* || 8.1.* || 8.2.* || 8.3.* -> your php version (8.4.8) does not satisfy that requirement.