Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires ibexa/core dev-ibx-8470-symfony-6 as 5.0.x-dev -> satisfiable by ibexa/core[dev-ibx-8470-symfony-6]. - ibexa/core dev-ibx-8470-symfony-6 requires pagerfanta/pagerfanta ^2.1 -> found pagerfanta/pagerfanta[v2.1.0, ..., v2.7.3] but it conflicts with your root composer.json require (^3.6.2).