diff --git a/requirements.dev.txt b/requirements.dev.txt
index 3696f8e..ea9085e 100644
--- a/requirements.dev.txt
+++ b/requirements.dev.txt
@@ -1,4 +1,5 @@
 nose>=1.3.7
 mock>=2.0.0
 coverage>=4.3
-flake8>=3.2
\ No newline at end of file
+flake8>=3.2
+tox>=2.7.0
\ No newline at end of file