Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires nyholm/psr7 ^1.8 -> satisfiable by nyholm/psr7[1.8.0, 1.8.1]. - nyholm/psr7[1.8.0, ..., 1.8.1] require php >=7.2 -> your php version (7.1.33) does not satisfy that requirement. Problem 2 - Root composer.json requires phpspec/prophecy ^1.18 -> satisfiable by phpspec/prophecy[v1.18.0]. - phpspec/prophecy v1.18.0 requires php ^7.2 || 8.0.* || 8.1.* || 8.2.* || 8.3.* -> your php version (7.1.33) does not satisfy that requirement. Problem 3 - phpspec/phpspec[5.1.0, ..., 5.1.2] require phpspec/prophecy ^1.7 -> satisfiable by phpspec/prophecy[v1.18.0]. - phpspec/phpspec[6.3.0, ..., 6.3.1] require php ^7.2 || 8.0.* -> your php version (7.1.33) does not satisfy that requirement. - phpspec/prophecy v1.18.0 requires php ^7.2 || 8.0.* || 8.1.* || 8.2.* || 8.3.* -> your php version (7.1.33) does not satisfy that requirement. - phpspec/phpspec 7.5.0 requires php ^7.3 || 8.0.* || 8.1.* || 8.2.* || 8.3.* -> your php version (7.1.33) does not satisfy that requirement. - Root composer.json requires phpspec/phpspec ^5.1 || ^6.3 || ^7.5 -> satisfiable by phpspec/phpspec[5.1.0, 5.1.1, 5.1.2, 6.3.0, 6.3.1, 7.5.0].