Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpcov ^9.0 -> satisfiable by phpunit/phpcov[9.0.0, 9.0.x-dev]. - phpunit/phpcov[9.0.0, ..., 9.0.x-dev] require phpunit/phpunit ^10.0 -> found phpunit/phpunit[dev-main, 10.0.0, ..., 10.4.x-dev (alias of dev-main)] but it conflicts with your root composer.json require (^9.5.5). Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.