diff --git a/tox.ini b/tox.ini
index d3c1a15..35dff45 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,7 +8,7 @@ envlist = py27, py33, py34, py35, pypy, flake8
 
 [testenv]
 deps =
-    pytest
+    -rrequirements.txt
 commands =
     py.test