diff --git a/test-requirements.txt b/test-requirements.txt
index 693daff..236a473 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -4,4 +4,5 @@
 flake8==2.0
 hacking>=0.5.6,<0.7
 # needed for doc build
+docutils==0.9.1
 sphinx>=1.1.2