March 28, 2013
This is Django 1.5.1, a bugfix release for Django 1.5. It's completely backwards compatible with Django 1.5, but includes a handful of fixes.
The biggest fix is for a memory leak introduced in Django 1.5. Under certain circumstances, repeated iteration over querysets could leak memory - sometimes quite a bit of it. If you'd like more information, the details are in our ticket tracker (and in a related issue in Python itself).
If you've noticed memory problems under Django 1.5, upgrading to 1.5.1 should fix those issues.
Django 1.5.1 also includes a couple smaller fixes: