# Django 2.2.9.dev20191202104323 文档

# Django 1.5.1 release notes

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:

- Module-level warnings emitted during tests are no longer silently hidden (#18985).
- Prevented filtering on password hashes in the user admin (#20078).