Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires infection/infection ^0.26.21 -> satisfiable by infection/infection[0.26.21]. - infection/infection 0.26.21 requires php ^8.1 -> your php version (7.4.33) does not satisfy that requirement. Problem 2 - Root composer.json requires phpbench/phpbench ^1.4 -> satisfiable by phpbench/phpbench[1.4.0]. - phpbench/phpbench 1.4.0 requires php ^8.1 -> your php version (7.4.33) does not satisfy that requirement.