diff --git a/tox.ini b/tox.ini
index 0574beaf..60e5d70b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,6 +5,7 @@ envlist = py26,py27,py34,pep8
 deps = -U
        -r{toxinidir}/tools/pip-requires
        -r{toxinidir}/tools/test-requires
+       --no-cache-dir
 usedevelop = True
 passenv= NOSE_VERBOSE
 commands =