Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires infection/infection ^0.27.11 -> satisfiable by infection/infection[0.27.11, 0.27.x-dev]. - infection/infection[0.27.11, ..., 0.27.x-dev] require nikic/php-parser ^4.15.1 -> found nikic/php-parser[v4.15.1, ..., 4.x-dev] but it conflicts with your root composer.json require (^5.4.0). Problem 2 - maglnet/composer-require-checker[4.7.1, ..., 4.8.x-dev] require nikic/php-parser ^4.17.1 -> found nikic/php-parser[v4.17.1, ..., 4.x-dev] but it conflicts with your root composer.json require (^5.4.0). - maglnet/composer-require-checker[4.9.0, ..., 4.10.x-dev] require nikic/php-parser ^4.18.0 -> found nikic/php-parser[v4.18.0, ..., 4.x-dev] but it conflicts with your root composer.json require (^5.4.0). - maglnet/composer-require-checker[4.11.0, ..., 4.12.x-dev] require nikic/php-parser ^4.19.1 -> found nikic/php-parser[v4.19.1, ..., 4.x-dev] but it conflicts with your root composer.json require (^5.4.0). - maglnet/composer-require-checker[4.13.0, ..., 4.15.x-dev] require nikic/php-parser ^4.19.4 -> found nikic/php-parser[v4.19.4, 4.x-dev] but it conflicts with your root composer.json require (^5.4.0). - Root composer.json requires maglnet/composer-require-checker ^4.7.1 -> satisfiable by maglnet/composer-require-checker[4.7.1, ..., 4.15.x-dev]. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.