Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires php ^7|^8 but your php version (5.4.45) does not satisfy that requirement. Problem 2 - paragonie/constant_time_encoding[v2.0.0, ..., v2.2.3] require php ^7 -> your php version (5.4.45) does not satisfy that requirement. - paragonie/constant_time_encoding[v2.3.0, ..., v2.8.0] require php ^7|^8 -> your php version (5.4.45) does not satisfy that requirement. - paragonie/constant_time_encoding[v3.0.0, ..., v3.1.1] require php ^8 -> your php version (5.4.45) does not satisfy that requirement. - Root composer.json requires paragonie/constant_time_encoding ^2|^3 -> satisfiable by paragonie/constant_time_encoding[v2.0.0, ..., v2.8.0, v3.0.0, v3.1.0, v3.1.1].