Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires neuron-php/mvc 0.8.* -> satisfiable by neuron-php/mvc[0.8.0, ..., 0.8.7]. - neuron-php/mvc[0.8.0, ..., 0.8.7] require php ^8.4 -> your php version (8.3.6) does not satisfy that requirement.