pip install django --upgrade installs older version

I had installed a development version of django on my dev box (django 1.3 alpha1). I want to upgrade to latest version.. when I :

pip install django --upgrade

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I get version 1.2.3 for some reason. How do I use pip to upgrade to the latest version?

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Found the answer, if you delete the django folder in your build directory (using a virtualenv btw) and then try the upgrade again it will work.