Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires shopsys/coding-standards 16.0.x-dev -> satisfiable by shopsys/coding-standards[16.0.x-dev]. - Root composer.json requires shopsys/framework 16.0.x-dev -> satisfiable by shopsys/framework[16.0.x-dev]. - nette/utils[v3.2.0, ..., v3.2.3] require php >=7.2 <8.1 -> your php version (8.3.14) does not satisfy that requirement. - nette/utils[v3.2.5, ..., v3.2.7] require php >=7.2 <8.2 -> your php version (8.3.14) does not satisfy that requirement. - nette/utils[v3.2.8, ..., v3.2.9] require php >=7.2 <8.3 -> your php version (8.3.14) does not satisfy that requirement. - nette/utils v4.0.0 requires php >=8.0 <8.3 -> your php version (8.3.14) does not satisfy that requirement. - shopsys/coding-standards 16.0.x-dev requires nette/utils ^3.1.3 -> satisfiable by nette/utils[v3.1.3, ..., v3.2.10]. - shopsys/framework 16.0.x-dev requires nette/utils ^4.0 -> satisfiable by nette/utils[v4.0.0, ..., v4.0.5]. - Conclusion: don't install nette/utils v4.0.5 (conflict analysis result) - You can only install one version of a package, so only one of these can be installed: nette/utils[v3.1.3, ..., v3.2.10, v4.0.0, ..., v4.0.5].