Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires webmozart/assert ^2.1 -> satisfiable by webmozart/assert[2.1.0, 2.1.1, 2.1.2]. - webmozart/assert[2.1.0, ..., 2.1.2] require php ^8.2 -> your php version (8.1.34) does not satisfy that requirement. Problem 2 - Root composer.json requires phpspec/phpspec ^7.0 -> satisfiable by phpspec/phpspec[7.0.0, ..., 7.6.0]. - phpdocumentor/reflection-docblock[5.2.0, ..., 5.6.5] require webmozart/assert ^1.9.1 -> found webmozart/assert[1.9.1, ..., 1.12.1] but it conflicts with your root composer.json require (^2.1). - phpdocumentor/reflection-docblock 5.6.6 requires webmozart/assert ^1.9.1 || ^2 -> satisfiable by webmozart/assert[2.1.0, 2.1.1, 2.1.2]. - phpspec/phpspec[7.0.0, ..., 7.1.0] require php ^7.3 || 8.0.* -> your php version (8.1.34) does not satisfy that requirement. - phpspec/phpspec[7.2.0, ..., 7.6.0] require phpspec/prophecy ^1.9 -> satisfiable by phpspec/prophecy[1.9.0, ..., v1.24.0]. - phpspec/prophecy[1.9.0, ..., v1.10.3] require php ^5.3|^7.0 -> your php version (8.1.34) does not satisfy that requirement. - phpspec/prophecy[1.11.0, ..., 1.11.1] require php ^7.2 -> your php version (8.1.34) does not satisfy that requirement. - phpspec/prophecy[1.12.0, ..., 1.13.0] require php ^7.2 || ~8.0, <8.1 -> your php version (8.1.34) does not satisfy that requirement. - phpspec/prophecy[1.14.0, ..., v1.22.0] require phpdocumentor/reflection-docblock ^5.2 -> satisfiable by phpdocumentor/reflection-docblock[5.2.0, ..., 5.6.6]. - phpspec/prophecy[v1.23.0, ..., v1.23.1] require php 8.2.* || 8.3.* || 8.4.* -> your php version (8.1.34) does not satisfy that requirement. - phpspec/prophecy v1.24.0 requires php 8.2.* || 8.3.* || 8.4.* || 8.5.* -> your php version (8.1.34) does not satisfy that requirement. - webmozart/assert[2.1.0, ..., 2.1.2] require php ^8.2 -> your php version (8.1.34) does not satisfy that requirement.