Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^13.0 -> satisfiable by phpunit/phpunit[13.0.0, ..., 13.1.7]. - Root composer.json requires ssch/typo3-rector ^2.10 || ^3.0 -> satisfiable by ssch/typo3-rector[v2.10.0, ..., v2.15.2, v3.0.0, ..., v3.14.1]. - Root composer.json requires typo3/cms-base-distribution ^12.0 || ^13.4 -> satisfiable by typo3/cms-base-distribution[v12.0.0, ..., v12.4.1, v13.4.0, v13.4.1]. - phpunit/php-code-coverage[13.0.0, ..., 13.0.2, 14.0.0, ..., 14.1.6] require nikic/php-parser ^5.7.0 -> satisfiable by nikic/php-parser[v5.7.0]. - phpunit/phpunit[13.0.1, ..., 13.0.6] require phpunit/php-code-coverage ^13.0.1 -> satisfiable by phpunit/php-code-coverage[13.0.1, 13.0.2]. - phpunit/phpunit[13.1.0, ..., 13.1.1] require phpunit/php-code-coverage ^14.0 -> satisfiable by phpunit/php-code-coverage[14.0.0, ..., 14.1.6]. - phpunit/phpunit[13.1.2, ..., 13.1.4] require phpunit/php-code-coverage ^14.1.1 -> satisfiable by phpunit/php-code-coverage[14.1.1, ..., 14.1.6]. - phpunit/phpunit 13.1.6 requires phpunit/php-code-coverage ^14.1.2 -> satisfiable by phpunit/php-code-coverage[14.1.2, ..., 14.1.6]. - phpunit/phpunit 13.1.7 requires phpunit/php-code-coverage ^14.1.3 -> satisfiable by phpunit/php-code-coverage[14.1.3, 14.1.4, 14.1.5, 14.1.6]. - Conclusion: don't install phpunit/phpunit[13.0.0] | install nikic/php-parser[v5.7.0] (conflict analysis result) - Conclusion: don't install nikic/php-parser v5.7.0 (conflict analysis result) Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.