Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires gedmo/doctrine-extensions ^3.8 -> satisfiable by gedmo/doctrine-extensions[v3.8.0, ..., 3.x-dev]. - gedmo/doctrine-extensions[v3.8.0, ..., v3.10.0] require doctrine/annotations ^1.13 -> found doctrine/annotations[1.13.0, ..., 1.14.x-dev] but it conflicts with your root composer.json require (^2.0). - gedmo/doctrine-extensions[v3.11.0, ..., 3.x-dev] require doctrine/collections ^1.2 || ^2.0 -> found doctrine/collections[v1.2, ..., 1.8.0, 2.0.0, ..., 2.6.x-dev] but it conflicts with your root composer.json require (^3.0).