diff --git a/tox.ini b/tox.ini
index 7503d53bd..b8ee702e4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -15,6 +15,7 @@ deps =
     django
     # Only required to run tests
     mock
+    mitmproxy
 commands =
     trial scrapy
 
@@ -29,6 +30,7 @@ deps =
     django==1.3.1
     cssselect==0.9.1
     mock==1.0.1
+    mitmproxy=0.9.2
 
 [testenv:trunk]
 basepython = python2.7
@@ -48,6 +50,7 @@ deps =
     w3lib>=1.5
     # Only required to run tests
     mock>=1.0.1
+    mitmproxy>=0.9.2
 commands =
     trial scrapy