diff --git a/global-requirements.txt b/global-requirements.txt
index 06434d9963..babcd6f997 100644
--- a/global-requirements.txt
+++ b/global-requirements.txt
@@ -65,7 +65,7 @@ influxdb>=2.2.0                       # MIT License
 ironic-lib>=1.3.0  # Apache-2.0
 ironic-discoverd>=1.0.0                # Apache-2.0
 ipaddress>=1.0.7;python_version<'3.3'  # PSF
-iso8601>=0.1.9  # MIT
+iso8601>=0.1.11  # MIT
 Jinja2>=2.8  # BSD License (3 clause)
 jsonpatch>=1.1  # BSD
 jsonpath-rw>=1.2.0,<2.0  # Apache-2.0