diff --git a/requirements/documentation.txt b/requirements/documentation.txt
index d8cba4655a..2718faf654 100644
--- a/requirements/documentation.txt
+++ b/requirements/documentation.txt
@@ -1,4 +1,4 @@
-Sphinx==2.0.1
+Sphinx==1.8.5
 
 sphinx-autobuild==0.7.1
 sphinx_rtd_theme==0.4.3