diff --git a/requirements.txt b/requirements.txt
index 01e85d1cc..246ba909e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,3 +2,4 @@ cssselect==0.7.1
 lxml==3.0.1
 pyquery==1.2.2
 wsgiref==0.1.2
+argparse