Your requirements could not be resolved to an installable set of packages. Problem 1 - stefandoorn/sitemap-plugin is present at version dev-3de33689d8a46a25a927ffb97cc8045863e3a4f4 and cannot be modified by Composer - Root composer.json requires sylius/state-machine-abstraction ^1.0 -> satisfiable by sylius/sylius[v1.14.0, v1.14.1], sylius/state-machine-abstraction[v1.13.0, ..., v1.14.1]. - stefandoorn/sitemap-plugin dev-3de33689d8a46a25a927ffb97cc8045863e3a4f4 conflicts with sylius/state-machine-abstraction * (sylius/sylius v1.14.1 replaces sylius/state-machine-abstraction self.version). - stefandoorn/sitemap-plugin dev-3de33689d8a46a25a927ffb97cc8045863e3a4f4 conflicts with sylius/state-machine-abstraction * (sylius/sylius v1.14.0 replaces sylius/state-machine-abstraction self.version). - stefandoorn/sitemap-plugin dev-3de33689d8a46a25a927ffb97cc8045863e3a4f4 conflicts with sylius/state-machine-abstraction v1.14.1.