need to upgrade django1.4.5-->django1.5, but apt-get install django tells me i'm running latest version

i get the following errors in the apache2 error.log:

VersionConflict: (Django 1.4.5 (/usr/lib/python2.7/dist-packages), Requirement.parse('Django>=1.5'))

but when i attempt upgradinging django apt-get install reports that i'm at the latest version:

 apt-get install python-django

Reading package lists... Done

Building dependency tree       

Reading state information... Done

python-django is already the newest version.

The following package was automatically installed and is no longer required:

  libmysqlclient16

Use 'apt-get autoremove' to remove it.

any suggestions?

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