Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires roadiz/core-bundle 2.5.x-dev -> satisfiable by roadiz/core-bundle[2.5.x-dev (alias of dev-develop)]. - roadiz/core-bundle dev-develop requires roadiz/documents 2.4.* -> found roadiz/documents[dev-master, v2.4.0, ..., 2.4.x-dev (alias of dev-master)] but it conflicts with your root composer.json require (2.5.x-dev). - roadiz/core-bundle 2.5.x-dev is an alias of roadiz/core-bundle dev-develop and thus requires it to be installed too.