Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpcov ^10.0 -> satisfiable by phpunit/phpcov[10.0.0]. - Root composer.json requires ssch/typo3-rector ^2.11 -> satisfiable by ssch/typo3-rector[v2.11.0]. - ssch/typo3-rector v2.11.0 requires nikic/php-parser ^4.18.0 -> satisfiable by nikic/php-parser[v4.18.0, ..., v4.19.4]. - Conclusion: install nikic/php-parser v5.3.1 (conflict analysis result) - You can only install one version of a package, so only one of these can be installed: nikic/php-parser[v4.18.0, ..., v4.19.4, v5.0.0, ..., v5.3.1].