diff --git a/lower-constraints.txt b/lower-constraints.txt
index bc8f6ebe..1b6bbb9e 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -13,7 +13,6 @@ Jinja2==2.10
 keystoneauth1==3.4.0
 linecache2==1.0.0
 MarkupSafe==1.0
-mock==2.0.0
 mox3==0.20.0
 os-client-config==1.28.0
 oslosphinx==4.7.0