Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires nextcloud/ocp dev-master -> satisfiable by nextcloud/ocp[dev-master]. - nextcloud/ocp dev-master requires psr/log ^1.1.4 -> found psr/log[1.1.4] but it conflicts with your root composer.json require (^3). Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.