Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires sylius/sylius ~1.10.14 -> satisfiable by sylius/sylius[v1.10.14]. - sylius/sylius v1.10.14 requires symfony/string ^5.2 -> found symfony/string[v5.2.0, ..., v5.4.29] but these were not loaded, likely because it conflicts with another require. Problem 2 - fzaninotto/faker[v1.6.0, ..., v1.9.2] require php ^5.3.3 || ^7.0 -> your php version (8.1.25) does not satisfy that requirement. - symfony/symfony[v4.4.0, ..., v4.4.8] require php ^7.1.3 -> your php version (8.1.25) does not satisfy that requirement. - Only one of these can be installed: symfony/symfony[v3.2.0, ..., v3.4.49, v4.1.0, ..., v4.4.50], symfony/config[v6.0.0, ..., v6.0.19]. symfony/symfony replaces symfony/config and thus cannot coexist with it. - setono/sylius-catalog-promotion-plugin[v0.4.0, ..., v0.4.4] require fzaninotto/faker ^1.9 -> satisfiable by fzaninotto/faker[v1.9.0, v1.9.1, v1.9.2]. - Root composer.json requires symfony/config ^5.4 || ^6.0 -> satisfiable by symfony/config[v6.0.0, ..., v6.0.19]. - setono/sylius-catalog-promotion-plugin[v0.4.5, ..., v0.4.8] require symfony/config ^4.4 || ^5.0 -> satisfiable by symfony/symfony[v4.4.0, ..., v4.4.50]. - Root composer.json requires setono/sylius-catalog-promotion-plugin ^0.4 -> satisfiable by setono/sylius-catalog-promotion-plugin[v0.4.0, ..., v0.4.8].