diff --git a/requirements.txt b/requirements.txt
index da65b0b..c8840e5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -49,6 +49,7 @@ pycparser==2.14
 pycrypto==2.6.1
 pymongo==3.3.0
 pyOpenSSL==0.15.1
+python-dateutil==2.5.3
 redis==2.10.5
 requests==2.9.1
 requests-oauthlib==0.6.2