Your requirements could not be resolved to an installable set of packages. Problem 1 - atoum/atoum[3.0.0, ..., 3.2.0] require php ^5.6.0 || ^7.0.0 -> your php version (8.2.23) does not satisfy that requirement. - atoum/atoum 3.3.0 requires php ^5.6.0 || ^7.0.0 <7.4.0 -> your php version (8.2.23) does not satisfy that requirement. - atoum/atoum[3.4.0, ..., 3.4.2] require php ^5.6.0 || ^7.0.0 <7.5.0 -> your php version (8.2.23) does not satisfy that requirement. - Root composer.json requires atoum/atoum ^3.0 -> satisfiable by atoum/atoum[3.0.0, ..., 3.4.2].