diff --git a/requirements.txt b/requirements.txt
index 5626296bd..63966402d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ pyexcel-io==0.5.6
 pyexcel-xls==0.5.5
 pyexcel-xlsx==0.5.5
 pyexcel-ods3==0.5.2
-pytz==2017.3
+pytz==2018.3
 gunicorn==19.7.1
 whitenoise==3.3.1  #manages static assets
 eventlet==0.22