diff --git a/setup.py b/setup.py
index a77ed679..08faed0d 100644
--- a/setup.py
+++ b/setup.py
@@ -25,6 +25,7 @@ required = [
     'virtualenv',
     'pew>=0.1.26',
     'pip',
+    'pip-tools'
 ]
 
 if sys.version_info < (2, 7):