diff --git a/requirements.txt b/requirements.txt
index 717403ddb..7888f1341 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 pbr>=0.6,<1.0
 anyjson>=0.3.3
-iso8601>=0.1.8
+iso8601>=0.1.9
 six>=1.5.2
 PyYAML>=3.1.0
 django-floppyforms>=1.1