diff --git a/requirements.txt b/requirements.txt
index 5f10ef907..4c6371c3f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,6 @@
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
 cliff>=3.4.0 # Apache-2.0
 debtcollector>=1.2.0 # Apache-2.0
-iso8601>=0.1.11 # MIT
 netaddr>=0.7.18 # BSD
 openstacksdk>=1.5.0 # Apache-2.0
 osc-lib>=1.12.0 # Apache-2.0