diff --git a/tox.ini b/tox.ini
index de36cc26a..238d7e0c0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,6 +5,7 @@ envlist = py26,py27,py33,pep8
 
 [testenv]
 usedevelop = True
+install_command = pip install -U {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
          LANG=en_US.UTF-8
          LANGUAGE=en_US:en