diff --git a/test-requirements.txt b/test-requirements.txt
index c03ae211c..599bdad50 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -4,6 +4,7 @@
 hacking<0.11,>=0.10.2
 
 coverage>=4.0 # Apache-2.0
+docutils>=0.11,!=0.13.1  # OSI-Approved Open Source, Public Domain
 fixtures>=3.0.0 # Apache-2.0/BSD
 mock>=2.0 # BSD
 oslosphinx>=4.7.0 # Apache-2.0