Your requirements could not be resolved to an installable set of packages.
Problem 1
- Root composer.json requires phpspec/prophecy ^1.17 -> satisfiable by phpspec/prophecy[v1.17.0].
- phpspec/prophecy v1.17.0 requires php ^7.2 || 8.0.* || 8.1.* || 8.2.* -> your php version (8.4.0-dev) does not satisfy that requirement.
Problem 2
- phpspec/prophecy-phpunit[v2.0.1, ..., v2.0.2] require phpspec/prophecy ^1.3 -> satisfiable by phpspec/prophecy[v1.17.0].
- phpspec/prophecy-phpunit v2.0.0 requires php ^7.3 -> your php version (8.4.0-dev) does not satisfy that requirement.
- phpspec/prophecy v1.17.0 requires php ^7.2 || 8.0.* || 8.1.* || 8.2.* -> your php version (8.4.0-dev) does not satisfy that requirement.
- Root composer.json requires phpspec/prophecy-phpunit ^2.0 -> satisfiable by phpspec/prophecy-phpunit[v2.0.0, v2.0.1, v2.0.2].