diff --git a/test-requirements.txt b/test-requirements.txt
index 7f2d65e..5e0d666 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -5,5 +5,6 @@
 bashate>=0.2 # Apache-2.0
 hacking<0.11,>=0.10.0
 
+docutils>=0.11,!=0.13.1  # OSI-Approved Open Source, Public Domain
 sphinx!=1.3b1,<1.4,>=1.2.1 # BSD
 oslosphinx>=4.7.0 # Apache-2.0