Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires ibexa/solr dev-ibx-8534-core-batch-2 -> satisfiable by ibexa/solr[dev-ibx-8534-core-batch-2]. - ibexa/solr dev-ibx-8534-core-batch-2 requires ibexa/core dev-ibx-8534-core-v5-p2 as 5.0.x-dev -> satisfiable by ibexa/core[dev-ibx-8534-core-v5-p2] from composer repo (https://repo.packagist.org) but ibexa/core 5.0.x-dev is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance.