Your requirements could not be resolved to an installable set of packages. Problem 1 - phpspec/phpspec[5.1.0, ..., 5.1.2] require php ^7.1, <7.4 -> your php version (8.4.0-dev) does not satisfy that requirement. - phpspec/phpspec 6.0.0 requires php ^7.2, <7.4 -> your php version (8.4.0-dev) does not satisfy that requirement. - phpspec/phpspec[6.1.0, ..., 6.2.2] require php ^7.2, <7.5 -> your php version (8.4.0-dev) does not satisfy that requirement. - phpspec/phpspec[6.3.0, ..., 6.3.1] require php ^7.2 || 8.0.* -> your php version (8.4.0-dev) does not satisfy that requirement. - phpspec/phpspec[7.0.0, ..., 7.1.0] require php ^7.3 || 8.0.* -> your php version (8.4.0-dev) does not satisfy that requirement. - phpspec/phpspec 7.2.0 requires php ^7.3 || 8.0.* || 8.1.* -> your php version (8.4.0-dev) does not satisfy that requirement. - phpspec/phpspec[7.3.0, ..., 7.4.0] require php ^7.3 || 8.0.* || 8.1.* || 8.2.* -> your php version (8.4.0-dev) 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 (8.4.0-dev) does not satisfy that requirement. - Root composer.json requires phpspec/phpspec ^5.1 || ^6.0 || ^7.0 -> satisfiable by phpspec/phpspec[5.1.0, 5.1.1, 5.1.2, 6.0.0, ..., 6.3.1, 7.0.0, ..., 7.5.0].