diff --git a/lower-constraints.txt b/lower-constraints.txt
index 9c76a6a7..4b889fc5 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -17,7 +17,6 @@ iso8601==0.1.11
 kazoo==2.2
 keystoneauth1==3.4.0
 linecache2==1.0.0
-mock==2.0.0
 monotonic==0.6
 mox3==0.20.0
 msgpack-python==0.4.0