Your requirements could not be resolved to an installable set of packages.
Problem 1
- infection/infection[0.27.0, ..., 0.27.9] require nikic/php-parser ^4.15.1 -> found nikic/php-parser[v4.15.1, ..., v4.18.0] but it conflicts with your root composer.json require (^v5.0.0).
- Root composer.json requires infection/infection ^0.27.0 -> satisfiable by infection/infection[0.27.0, ..., 0.27.9].