Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires php >=8.0 but your php version (7.4.27) does not satisfy that requirement. Problem 2 - Root composer.json requires firebase/php-jwt ^7.0 -> satisfiable by firebase/php-jwt[v7.0.0, v7.0.1, v7.0.2]. - firebase/php-jwt[v7.0.0, ..., v7.0.2] require php ^8.0 -> your php version (7.4.27) does not satisfy that requirement.