diff --git a/requirements.txt b/requirements.txt
index 4efe391fc0..5a59e924e6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -51,7 +51,6 @@ python-keystoneclient>=3.20.0 # Apache-2.0
 python-octaviaclient>=2.1.0 # Apache-2.0
 requests>=2.20.1 # Apache-2.0
 setuptools!=34.0.0,!=34.0.1,!=34.0.2,!=34.0.3,!=34.1.0,!=34.1.1,!=34.2.0,!=34.3.0,!=34.3.1,!=34.3.2,!=36.2.0,>=30.0.0 # PSF/ZPL
-six>=1.10.0 # MIT
 stevedore>=3.3.0 # Apache-2.0
 taskflow>=2.16.0 # Apache-2.0
 cryptography>=2.1.4 # BSD/Apache-2.0