rough-minister-58256
11/08/2016, 11:33 PMpython-dateutil>=2.1,<3.0.0
could pin to the highest available version - and then if you were to subsequently add python-dateutil==2.5.3
into the mix it would be unsatisfiable because the range’d resolve would be cached at that higher version. the arg I mentioned should help if that’s the case.