diff --git a/requirements.txt b/requirements.txt
index c5f7c47e57..d020922cad 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ Django>=1.4,<1.7
 django_compressor>=1.3
 django_openstack_auth>=1.1.4
 eventlet>=0.13.0
-iso8601>=0.1.8
+iso8601>=0.1.9
 kombu>=2.4.8
 lesscpy>=0.9j
 # Horizon Utility Requirements