Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires rector/rector-src dev-tv-rector-avoid-before-traverser -> satisfiable by rector/rector-src[dev-tv-rector-avoid-before-traverser]. - rector/rector-src dev-tv-rector-avoid-before-traverser requires rector/rector-phpunit dev-tv-file-node -> satisfiable by rector/rector-phpunit[dev-tv-file-node] from composer repo (https://repo.packagist.org) but rector/rector-phpunit dev-main is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance.