Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires php >=8.1 but your php version (7.4.33) does not satisfy that requirement. Problem 2 - Root composer.json requires theodorejb/peachy-sql dev-master -> satisfiable by theodorejb/peachy-sql[dev-master]. - theodorejb/peachy-sql dev-master requires php >=8.1 -> your php version (7.4.33) does not satisfy that requirement. Problem 3 - Root composer.json requires phpunit/phpunit ^10.5 -> satisfiable by phpunit/phpunit[10.5.0, ..., 10.5.35]. - phpunit/phpunit[10.5.0, ..., 10.5.35] require php >=8.1 -> your php version (7.4.33) does not satisfy that requirement.