diff --git a/lower-constraints.txt b/lower-constraints.txt
index 1939f8f..5efec83 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -15,7 +15,6 @@ coverage==4.0 # Apache-2.0
 python-subunit==0.0.18 # Apache-2.0/BSD
 oslotest==1.10.0 # Apache-2.0
 stestr==2.0 # Apache-2.0
-mock==2.0 # BSD
 python-openstackclient==3.14 # Apache-2.0
 
 # doc/requirements.txt