diff --git a/requirements-test.txt b/requirements-test.txt
index e004cf0..319ce07 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1,2 +1,4 @@
 py==1.4.26
 pytest==2.7.0
+tox==1.9.2
+virtualenv==12.1.1