diff --git a/tox.ini b/tox.ini
index c2edccc..1ac80fb 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,6 @@
 [tox]
 envlist=
+    py33-django-dev,
     py33-django15,
     py32-django15,
     py26-django15,
@@ -44,6 +45,11 @@ basepython=python3.2
 deps=
     django==1.5
 
+[testenv:py33-django-dev]
+basepython=python3.3
+deps=
+    https://github.com/django/django/archive/master.zip
+
 [testenv:docs]
 changedir=docs
 deps=Sphinx