Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpspec/prophecy ^1.20 -> satisfiable by phpspec/prophecy[v1.20.0]. - phpspec/prophecy v1.20.0 requires php ^7.2 || 8.0.* || 8.1.* || 8.2.* || 8.3.* || 8.4.* -> your php version (8.5.0-dev) does not satisfy that requirement. Problem 2 - Root composer.json requires phpspec/prophecy-phpunit ^2.2 -> satisfiable by phpspec/prophecy-phpunit[v2.2.0, v2.3.0]. - phpspec/prophecy v1.20.0 requires php ^7.2 || 8.0.* || 8.1.* || 8.2.* || 8.3.* || 8.4.* -> your php version (8.5.0-dev) does not satisfy that requirement. - phpspec/prophecy-phpunit[v2.2.0, ..., v2.3.0] require phpspec/prophecy ^1.18 -> satisfiable by phpspec/prophecy[v1.20.0].