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Updating dependencies
Your requirements could not be resolved to an installable set of packages.
Problem 1
- Root composer.json requires main/dep * -> satisfiable by main/dep[1.0.0].
- main/dep 1.0.0 requires locked/dep ^2.1 -> found locked/dep[2.1.0] in the lock file but not in remote repositories, make sure you avoid updating this package to keep the one from the lock file.