Your requirements could not be resolved to an installable set of packages. Problem 1 - phpspec/prophecy[1.10.0, ..., v1.10.3] require php ^5.3|^7.0 -> your php version (8.4.0-dev) does not satisfy that requirement. - phpspec/prophecy[1.11.0, ..., 1.11.1] require php ^7.2 -> your php version (8.4.0-dev) does not satisfy that requirement. - phpspec/prophecy[1.12.0, ..., 1.13.0] require php ^7.2 || ~8.0, <8.1 -> your php version (8.4.0-dev) does not satisfy that requirement. - phpspec/prophecy[1.14.0, ..., v1.15.0] require php ^7.2 || ~8.0, <8.2 -> your php version (8.4.0-dev) does not satisfy that requirement. - phpspec/prophecy[v1.16.0, ..., v1.17.0] require php ^7.2 || 8.0.* || 8.1.* || 8.2.* -> your php version (8.4.0-dev) does not satisfy that requirement. - phpspec/prophecy[v1.18.0, ..., v1.19.0] require php ^7.2 || 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/prophecy ^1.10 -> satisfiable by phpspec/prophecy[1.10.0, ..., v1.19.0].