diff --git a/heatclient/tests/unit/__init__.py b/heatclient/tests/unit/__init__.py
index b1967c8f..e69de29b 100644
--- a/heatclient/tests/unit/__init__.py
+++ b/heatclient/tests/unit/__init__.py
@@ -1,5 +0,0 @@
-import sys
-
-from mox3 import mox
-
-sys.modules['mox'] = mox
diff --git a/lower-constraints.txt b/lower-constraints.txt
index 8a1c4eee..e1897e34 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -33,7 +33,6 @@ MarkupSafe==1.0
 mccabe==0.2.1
 mock==2.0.0
 monotonic==0.6
-mox3==0.20.0
 msgpack-python==0.4.0
 munch==2.1.0
 netaddr==0.7.18
diff --git a/test-requirements.txt b/test-requirements.txt
index 39cdce82..4f6c9a32 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -8,7 +8,6 @@ coverage!=4.4,>=4.0 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
 requests-mock>=1.2.0 # Apache-2.0
 mock>=2.0.0 # BSD
-mox3>=0.20.0 # Apache-2.0
 python-openstackclient>=3.12.0 # Apache-2.0
 stestr>=2.0.0 # Apache-2.0
 tempest>=17.1.0 # Apache-2.0