'Upgrade the Python package dateutil: Could not find a version

I tried to upgrade dateutil from 2.5.3 to the newest version 2.6.0 with pip install dateutil --upgrade, but got the issue Could not find a version.

$ pip install dateutil --upgrade
Collecting dateutil
  Could not find a version that satisfies the requirement dateutil (from versions: )
No matching distribution found for dateutil

I checked the post Could not find a version that satisfies the requirement . Running pip freeze | grep dateutil got,

$ pip freeze | grep dateutil
python-dateutil==2.5.3

How do I know which version satisfies my machine? Is it possible to upgrade dateutil to the newest version?



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