diff --git a/requirements.txt b/requirements.txt
index 97b223f..04b5dbf 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@
 # that is a likely indicator that the feature belongs somewhere else.
 
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
-six>=1.9.0 # MIT
+six>=1.10.0 # MIT
 msgpack-python>=0.4.0 # Apache-2.0
 oslo.utils>=3.31.0 # Apache-2.0
 pytz>=2013.6 # MIT