diff --git a/lower-constraints.txt b/lower-constraints.txt
index 4f330164..18dba4f3 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -12,7 +12,6 @@ imagesize==0.7.1
 Jinja2==2.10
 linecache2==1.0.0
 MarkupSafe==1.0
-mock==2.0.0
 pbr==2.0.0
 prettytable==0.7.2
 Pygments==2.2.0
diff --git a/test-requirements.txt b/test-requirements.txt
index d013b213..686ff616 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -5,7 +5,6 @@
 python-subunit>=1.0.0 # Apache-2.0/BSD
 stestr>=1.0.0 # Apache-2.0
 testtools>=2.2.0 # MIT
-mock>=2.0.0 # BSD
 testscenarios>=0.4 # Apache-2.0/BSD
 
 coverage!=4.4,>=4.0 # Apache-2.0