diff --git a/docs/requirements.txt b/docs/requirements.txt
index 4b1565b36b..bbd41a7151 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -2,3 +2,4 @@ Sphinx==1.8.5
 Pygments==2.2.0
 sphinx-autobuild
 sphinx_rtd_theme==0.2.5b1
+docutils==0.16