Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^10.3.2 -> satisfiable by phpunit/phpunit[10.3.2, 10.3.x-dev, 10.4.x-dev]. - phpunit/phpunit[10.3.2, ..., 10.4.x-dev] require php >=8.1 -> your php version (8.0.29) does not satisfy that requirement. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.