Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires nettrine/fixtures ^0.8.0 -> satisfiable by nettrine/fixtures[0.8.x-dev (alias of dev-master)]. - Root composer.json requires nettrine/orm ^0.9.0 -> satisfiable by nettrine/orm[v0.9.0]. - doctrine/orm[3.3.0, ..., 3.4.x-dev] require doctrine/lexer ^3 -> satisfiable by doctrine/lexer[3.0.0, 3.0.1, 3.0.x-dev, 3.1.x-dev]. - nettrine/fixtures dev-master requires doctrine/orm ^3.3.0 -> satisfiable by doctrine/orm[3.3.0, 3.3.1, 3.3.x-dev, 3.4.x-dev]. - Conclusion: don't install doctrine/lexer 3.0.1 (conflict analysis result) - nettrine/fixtures 0.8.x-dev is an alias of nettrine/fixtures dev-master and thus requires it to be installed too. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.

Process completed with exit code 2.

Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires nettrine/fixtures ^0.8.0 -> satisfiable by nettrine/fixtures[0.8.x-dev (alias of dev-master)]. - Root composer.json requires nettrine/orm ^0.9.0 -> satisfiable by nettrine/orm[v0.9.0]. - doctrine/orm[3.3.0, ..., 3.4.x-dev] require doctrine/lexer ^3 -> satisfiable by doctrine/lexer[3.0.0, 3.0.1, 3.0.x-dev, 3.1.x-dev]. - nettrine/fixtures dev-master requires doctrine/orm ^3.3.0 -> satisfiable by doctrine/orm[3.3.0, 3.3.1, 3.3.x-dev, 3.4.x-dev]. - Conclusion: don't install doctrine/lexer 3.0.1 (conflict analysis result) - nettrine/fixtures 0.8.x-dev is an alias of nettrine/fixtures dev-master and thus requires it to be installed too. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.