diff --git a/global-requirements.txt b/global-requirements.txt
index f44fcd62c2..a27376eab0 100644
--- a/global-requirements.txt
+++ b/global-requirements.txt
@@ -27,7 +27,7 @@ gear
 greenlet>=0.3.2
 happybase>=0.4,<=0.6
 httplib2>=0.7.5
-iso8601>=0.1.8
+iso8601>=0.1.9
 Jinja2
 jsonpatch>=1.1
 jsonpath-rw>=1.2.0,<2.0