Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires doctrine/orm ^2.19.7 || ^3.2 -> satisfiable by doctrine/orm[3.2.0, 3.2.1, 3.2.2]. - doctrine/orm[3.2.0, ..., 3.2.2] require doctrine/lexer ^3 -> found doctrine/lexer[3.0.0, 3.0.1] but the package is fixed to 2.0.0 (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.