Your requirements could not be resolved to an installable set of packages. Problem 1 - phpunit/php-code-coverage[11.0.0, ..., 11.0.x-dev] require nikic/php-parser ^5.0 -> found nikic/php-parser[dev-master, v5.0.0alpha1, ..., 5.0.x-dev (alias of dev-master)] but it conflicts with your root composer.json require (^4.17.1). - phpunit/phpunit[11.0.2, ..., 11.1.x-dev] require phpunit/php-code-coverage ^11.0 -> satisfiable by phpunit/php-code-coverage[11.0.0, 11.0.x-dev]. - Root composer.json requires phpunit/phpunit ^11.0.2 -> satisfiable by phpunit/phpunit[11.0.2, 11.0.x-dev, 11.1.x-dev]. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.