diff --git a/requirements.txt b/requirements.txt
index f34aff4..96d4923 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,6 +21,7 @@ ply==3.4
 pyflakes==0.5.0
 pylint==0.25.2
 python-dateutil==2.1
+pytz==2015.4
 requests==1.2.3
 requests-oauthlib==0.3.2
 six==1.9.0