Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^10.4 -> satisfiable by phpunit/phpunit[10.4.0, ..., 10.5.x-dev]. - phpunit/phpunit[10.4.0, ..., 10.5.x-dev] require php >=8.1 -> your php version (8.0.30) does not satisfy that requirement. Problem 2 - codeception/codeception[5.0.8, ..., 5.0.x-dev] require phpunit/phpunit ^9.5.20 || ^10.0 -> satisfiable by phpunit/phpunit[10.4.0, ..., 10.5.x-dev]. - codeception/codeception[5.0.0-alpha1, ..., 5.0.0-alpha3] require phpunit/phpunit dev-master as 9.5.99 -> found phpunit/phpunit[dev-main, dev-issue-4321/new-xml-logfile-format, 3.7.0, ..., 3.7.38, 4.0.0, ..., 4.8.36, 5.0.0, ..., 5.7.27, 6.0.0, ..., 6.5.14, 7.0.0, ..., 7.5.20, 8.0.0, ..., 8.5.x-dev, 9.0.0, ..., 9.6.x-dev, 10.0.0, ..., 10.5.x-dev, 11.0.x-dev (alias of dev-main)] but it does not match the constraint. Perhaps dev-master was renamed to dev-main? - codeception/codeception[5.0.0-RC1, ..., 5.0.6] require phpunit/phpunit ^9.5 -> found phpunit/phpunit[9.5.0, ..., 9.6.x-dev] but it conflicts with your root composer.json require (^10.4). - codeception/codeception 5.0.7 requires phpunit/phpunit ^9.5.20 -> found phpunit/phpunit[9.5.20, ..., 9.6.x-dev] but it conflicts with your root composer.json require (^10.4). - phpunit/phpunit[10.4.0, ..., 10.5.x-dev] require php >=8.1 -> your php version (8.0.30) does not satisfy that requirement. - Root composer.json requires codeception/codeception ^5.0 -> satisfiable by codeception/codeception[5.0.0-alpha1, ..., 5.0.x-dev].