diff --git a/requirements.pip b/requirements.pip
index 035cb00..4e076f7 100755
--- a/requirements.pip
+++ b/requirements.pip
@@ -18,7 +18,7 @@ graphql-core==2.0
 graphql-relay==0.4.5
 gunicorn==19.3.0
 idna==2.6
-iso8601==0.1.12
+iso8601==0.1.16
 itypes==1.1.0
 Jinja2==2.10.1
 MarkupSafe==1.0