Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires php-xapi/client dev-main as 0.7, found php-xapi/client[0.7.x-dev] but it does not match the constraint. Problem 2 - Root composer.json requires php-xapi/model dev-main as v3.1.0, found php-xapi/model[dev-master, v0.1.0, ..., v0.5.1, v1.0.0, ..., 1.x-dev, v2.0.0, ..., 2.x-dev, v3.0.0, 3.0.x-dev (alias of dev-master), v3.1.0] but it does not match the constraint. Problem 3 - Root composer.json requires php-xapi/repository-api dev-main as 0.3.1, found php-xapi/repository-api[dev-master, 0.4.x-dev (alias of dev-master)] but it does not match the constraint. Problem 4 - Root composer.json requires php-xapi/repository-doctrine dev-main, found php-xapi/repository-doctrine[dev-master, v0.1.0, ..., 0.4.x-dev (alias of dev-master)] but it does not match the constraint. Problem 5 - Root composer.json requires php-xapi/symfony-serializer dev-main as 2.0, found php-xapi/symfony-serializer[dev-master, v0.1.0, v1.0.0, v2.0.0, v2.1.0, 2.2.x-dev (alias of dev-master)] but it does not match the constraint.