Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires infection/infection ^0.29.9 || ^0.32.2 -> satisfiable by infection/infection[0.29.9, ..., 0.32.7]. - infection/infection[0.29.10, ..., 0.32.6] require php ^8.2 -> your php version (8.1.34) does not satisfy that requirement. - infection/infection 0.29.9 requires thecodingmachine/safe dev-master as 2.5.0 -> found thecodingmachine/safe[dev-master] but it does not match your minimum-stability. - infection/infection 0.32.7 requires php ^8.3 -> your php version (8.1.34) does not satisfy that requirement.