Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires php ^8.0 but your php version (7.4.33) does not satisfy that requirement. Problem 2 - infection/infection[0.29.0, ..., 0.29.x-dev] require php ^8.1 -> your php version (7.4.33) does not satisfy that requirement. - Root composer.json requires infection/infection ^0.29 -> satisfiable by infection/infection[0.29.0, ..., 0.29.x-dev].