Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires psr/http-factory ^1.1 -> satisfiable by psr/http-factory[1.1.0]. - psr/http-factory 1.1.0 requires php >=7.1 -> your php version (5.6.40) does not satisfy that requirement. Problem 2 - Root composer.json requires psr/http-message ^2.0 -> satisfiable by psr/http-message[2.0]. - psr/http-message 2.0 requires php ^7.2 || ^8.0 -> your php version (5.6.40) does not satisfy that requirement. Problem 3 - psr/http-client 1.0.0 requires php ^7.0 -> your php version (5.6.40) does not satisfy that requirement. - psr/http-client[1.0.1, ..., 1.0.3] require php ^7.0 || ^8.0 -> your php version (5.6.40) does not satisfy that requirement. - Root composer.json requires psr/http-client ^1.0 -> satisfiable by psr/http-client[1.0.0, 1.0.1, 1.0.2, 1.0.3].