1 files changed, 3 insertions, 0 deletions

diff --git a/requirements.txt b/requirements.txt
index a5a4e3a3..7bb02202 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,3 +2,6 @@ Sphinx>=1.4.3
 sphinx-rtd-theme
 setuptools
 docutils
+lxml
+sphinx-notfound-page
+docutils<0.18