Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires swag-industries/doctrine-domain-events ^3.1 -> satisfiable by swag-industries/doctrine-domain-events[v3.1.0]. - swag-industries/doctrine-domain-events v3.1.0 requires php >=8.1 -> your php version (7.4.33) does not satisfy that requirement.