diff --git a/requirements/base.txt b/requirements/base.txt
index a4416c94..35bdd37b 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -13,7 +13,7 @@ gunicorn==19.8.1
 gviz_api==1.9.0
 py-bcrypt==0.4
 psycopg2==2.7.5
-pytz==2018.4
+pytz==2018.5
 requests==2.19.1
 static==1.1.1
 whitenoise==3.3.1