diff --git a/requirements.txt b/requirements.txt
index 82cdbd5d..0cd97144 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,6 @@ Babel>=1.3
 eventlet>=0.17.4
 Flask<1.0,>=0.10
 greenlet>=0.3.2
-iso8601>=0.1.9
 Jinja2>=2.8 # BSD License (3 clause)
 jsonschema!=2.5.0,<3.0.0,>=2.0.0
 keystonemiddleware!=2.4.0,>=2.0.0