diff --git a/requirements.txt b/requirements.txt
index d8d93eb99..13fd58007 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ django-compressor>=2.0 # MIT
 django-openstack-auth>=2.2.0 # Apache-2.0
 django-pyscss>=2.0.2 # BSD License (2 clause)
 httplib2>=0.7.5 # MIT
-iso8601>=0.1.9 # MIT
+iso8601>=0.1.11 # MIT
 netaddr!=0.7.16,>=0.7.12 # BSD
 oslo.concurrency>=3.5.0 # Apache-2.0
 oslo.config>=3.9.0 # Apache-2.0