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Updating a single package doesn't work #782
I think the problem is that it keeps the installed packages locked at their version, and if your installed packages don't match the lock file, then you update and it dumps what you had installed in the lock file, instead of following the lockfile + updating the required package. This may not be the only problem, but it's something I have noticed.
my comment from November 2015 still holds true. If you have an issue, please open a new ticket, with details about what you expect and what happens instead, instead of telling us that you face the same bug than here, whole this one was fixed in 2012 (and so your issue is probably a different one)