Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires infection/infection ^0.27.8 -> satisfiable by infection/infection[0.27.8, 0.27.x-dev]. - infection/infection[0.27.8, ..., 0.27.x-dev] require php ^8.1 -> your php version (8.0.30) does not satisfy that requirement. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.