diff --git a/tox.ini b/tox.ini
index ed436d933..cebffbccc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -39,13 +39,12 @@ commands =
 [testenv:py33]
 basepython = python3.3
 deps =
-    Twisted>=13.2.0
+    svn+svn://svn.twistedmatrix.com/svn/Twisted/trunk#egg=Twisted
     lxml>=3.2.4
     pyOpenSSL>=0.13.1
     cssselect>=0.9
     queuelib>=1.1.1
     w3lib>=1.5
-    -rtests-requirements.txt
 commands =
     trial {posargs:scrapy}