diff --git a/lower-constraints.txt b/lower-constraints.txt
index 2b0205e9..2728b677 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -45,7 +45,6 @@ linecache2==1.0.0
 MarkupSafe==1.0
 mccabe==0.2.1
 mistral-lib==1.2.0
-mock==2.0.0
 monotonic==1.4
 mox3==0.25.0
 msgpack==0.5.6
diff --git a/requirements.txt b/requirements.txt
index 9712080f..3696992c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,5 +4,5 @@
 
 pbr>=3.1.1 # Apache-2.0
 six>=1.11.0 # MIT
-
+PyYAML>=3.12 # MIT
 ansible-runner>=1.4.4 # Apache-2.0
diff --git a/test-requirements.txt b/test-requirements.txt
index d6a99f42..0f51af59 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -5,7 +5,6 @@
 openstackdocstheme>=1.20.0 # Apache-2.0
 hacking<0.12,>=0.11.0 # Apache-2.0
 
-mock>=2.0.0 # BSD
 coverage!=4.4,>=4.0 # Apache-2.0
 python-subunit>=1.0.0 # Apache-2.0/BSD
 sphinx>=1.8.0,<2.0.0;python_version=='2.7' # BSD