diff --git a/tox.ini b/tox.ini
--- a/tox.ini
+++ b/tox.ini
@@ -6,7 +6,8 @@ envlist = py{26,27}-pytest
 setenv =
     PYTHONHASHSEED = 0
 deps =
-    pytest: pytest
+    -r{toxinidir}/dev_requirements.txt
+    py26-pytest: unittest2
     python-ldap
     python-pam
 commands =