Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires doctrine/doctrine-bundle ^2.4 -> satisfiable by doctrine/doctrine-bundle[2.4.0, ..., 2.13.2]. - doctrine/doctrine-bundle[2.7.1, ..., 2.13.2] require doctrine/persistence ^2.2 || ^3 -> found doctrine/persistence[2.2.0, ..., 2.5.7, 3.0.0, ..., 3.4.0] but it conflicts with your root composer.json require (^4.0). - doctrine/doctrine-bundle[2.4.0, ..., 2.4.4] require doctrine/persistence ^1.3.3|^2.0 -> found doctrine/persistence[1.3.3, ..., 1.3.8, 2.0.0, ..., 2.5.7] but it conflicts with your root composer.json require (^4.0). - doctrine/doctrine-bundle[2.5.0, ..., 2.6.2] require doctrine/persistence ^2.2 -> found doctrine/persistence[2.2.0, ..., 2.5.7] but it conflicts with your root composer.json require (^4.0). - doctrine/doctrine-bundle[2.6.3, ..., 2.7.0] require doctrine/persistence ^2.2|^3 -> found doctrine/persistence[2.2.0, ..., 2.5.7, 3.0.0, ..., 3.4.0] but it conflicts with your root composer.json require (^4.0).