Updated from global requirements

Change-Id: If85fc5f67710648889d883ab0632101bb094b8e5
diff --git a/requirements.txt b/requirements.txt
index 80b424b..3d6be99 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,4 +6,4 @@
 dnspython3!=1.13.0,!=1.14.0,>=1.12.0;python_version>='3.0' # http://www.dnspython.org/LICENSE
 ddt>=1.0.1 # MIT
 testtools>=1.4.0 # MIT
-tempest>=14.0.0 # Apache-2.0
+tempest>=16.1.0 # Apache-2.0