diff --git a/requirements.txt b/requirements.txt
index d5a85012..d36376af 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,6 +6,7 @@ pbr>=1.8 # Apache-2.0
 iso8601>=0.1.11 # MIT
 lxml>=2.3 # BSD
 oslo.config!=3.18.0,>=3.14.0 # Apache-2.0
+docutils>=0.11,!=0.13.1  # OSI-Approved Open Source, Public Domain
 sphinx!=1.3b1,<1.4,>=1.2.1 # BSD
 demjson # GLGPLv3+
 PyYAML>=3.10.0 # MIT