diff --git a/lower-constraints.txt b/lower-constraints.txt
index 1a5215a..94c6e99 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -22,7 +22,6 @@ libvirt-python==3.7.0
 linecache2==1.0.0
 MarkupSafe==1.0
 mccabe==0.2.1
-mock==2.0.0
 mox3==0.20.0
 openstackdocstheme==2.2.1
 os-client-config==1.28.0