Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires nextcloud/ocp dev-stable31 -> satisfiable by nextcloud/ocp[dev-stable31]. - nextcloud/ocp dev-stable31 requires psr/log ^3.0.2 -> found psr/log[3.0.2] but the package is fixed to 1.1.4 (lock file version) by a partial update and that version does not match. Make sure you list it as an argument for the update command. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.