Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires infection/infection ^0.29.10 -> satisfiable by infection/infection[0.29.10, 0.29.x-dev]. - infection/infection[0.29.10, ..., 0.29.x-dev] require php ^8.2 -> your php version (8.1.31) does not satisfy that requirement. Problem 2 - Root composer.json requires maglnet/composer-require-checker ^4.16.1 -> satisfiable by maglnet/composer-require-checker[4.16.1, 4.16.x-dev, 4.17.x-dev]. - maglnet/composer-require-checker[4.16.1, ..., 4.17.x-dev] require php ~8.2.0 || ~8.3.0 || ~8.4.0 -> your php version (8.1.31) 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.