diff --git a/requirements.txt b/requirements.txt
index d204dac371..947da18868 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,4 +11,5 @@ oslo.config!=3.18.0,>=3.14.0 # Apache-2.0
 oslo.utils>=3.18.0 # Apache-2.0
 setuptools!=24.0.0,>=16.0 # PSF/ZPL
 pycrypto>=2.6 # Public Domain
+PyYAML>=3.10.0  # MIT
 netaddr!=0.7.16,>=0.7.13 # BSD