diff --git a/lower-constraints.txt b/lower-constraints.txt
index 5189eeb..adde6d7 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -18,7 +18,6 @@ idna==2.6
 iso8601==0.1.12
 keystoneauth1==3.4.0
 linecache2==1.0.0
-mock==2.0.0
 monotonic==1.4
 mox3==0.20.0
 msgpack==0.5.6
diff --git a/test-requirements.txt b/test-requirements.txt
index 9098899..6ec717e 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -10,7 +10,6 @@
 hacking>=3.0.1,<3.1.0 # Apache-2.0
 #
 coverage!=4.4,>=4.0 # Apache-2.0
-mock>=2.0.0 # BSD
 nodeenv>=0.9.4 # BSD
 pytest>=5.3.5 # MIT
 testtools>=2.2.0 # MIT