diff --git a/requirements.txt b/requirements.txt
index b3d53bc..07153c5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,6 +7,5 @@ oslo.messaging>=5.2.0 # Apache-2.0
 oslo.utils>=4.7.0 # Apache-2.0
 pbr>=1.6 # Apache-2.0
 pycadf!=2.0.0,>=1.1.0 # Apache-2.0
-six>=1.9.0 # MIT
 keystoneauth1>=2.18.0  # Apache-2.0
 python-keystoneclient>=3.8.0  # Apache-2.0