Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires friendsofphp/php-cs-fixer ^3.13 -> satisfiable by friendsofphp/php-cs-fixer[v3.13.0, ..., v3.68.3]. - Root composer.json requires phpunit/phpunit ^7.5 -> satisfiable by phpunit/phpunit[7.5.0, ..., 7.5.20]. - friendsofphp/php-cs-fixer[v3.13.0, ..., v3.13.2] require sebastian/diff ^4.0 -> satisfiable by sebastian/diff[4.0.0, ..., 4.0.6]. - friendsofphp/php-cs-fixer v3.21.1 requires php ^8.0.1 -> your php version (7.4.33) does not satisfy that requirement. - phpunit/phpunit[7.5.0, ..., 7.5.6] require sebastian/diff ^3.0 -> satisfiable by sebastian/diff[3.0.0, ..., 3.0.6]. - Conclusion: don't install sebastian/diff 3.0.6 (conflict analysis result) - Conclusion: don't install sebastian/diff 4.0.6 (conflict analysis result) - Conclusion: don't install phpunit/phpunit 7.5.20 (conflict analysis result) - Conclusion: don't install friendsofphp/php-cs-fixer v3.14.0 (conflict analysis result) - Conclusion: don't install friendsofphp/php-cs-fixer v3.14.1 (conflict analysis result) - Conclusion: don't install friendsofphp/php-cs-fixer v3.14.2 (conflict analysis result) - Conclusion: don't install friendsofphp/php-cs-fixer v3.14.3 (conflict analysis result) - Conclusion: don't install friendsofphp/php-cs-fixer v3.24.0 (conflict analysis result) - Conclusion: don't install friendsofphp/php-cs-fixer v3.34.0 (conflict analysis result) - Conclusion: don't install friendsofphp/php-cs-fixer v3.38.2 (conflict analysis result) - Conclusion: don't install friendsofphp/php-cs-fixer v3.39.1 (conflict analysis result) - Conclusion: don't install friendsofphp/php-cs-fixer v3.45.0 (conflict analysis result) - Conclusion: don't install friendsofphp/php-cs-fixer v3.49.0 (conflict analysis result) - Conclusion: don't install friendsofphp/php-cs-fixer v3.56.2 (conflict analysis result) - Conclusion: don't install friendsofphp/php-cs-fixer v3.64.0 (conflict analysis result) - Conclusion: don't install friendsofphp/php-cs-fixer v3.65.0 (conflict analysis result) - Conclusion: don't install friendsofphp/php-cs-fixer v3.66.0 (conflict analysis result) - Conclusion: don't install friendsofphp/php-cs-fixer v3.68.3 (conflict analysis result) - You can only install one version of a package, so only one of these can be installed: sebastian/diff[1.1.0, ..., 1.4.3, 2.0.1, 3.0.0, ..., 3.0.6, 4.0.0, ..., 4.0.6, 5.0.0, ..., 5.1.1, 6.0.0, 6.0.1, 6.0.2].