diff --git a/python/setup.py b/python/setup.py
index 9b1cf77..55a7e47 100755
--- a/python/setup.py
+++ b/python/setup.py
@@ -43,6 +43,7 @@ def find_version(*file_paths):
     "fastnumbers>=3.1.0",
 	"seaborn>=0.11.0",
 	"progressbar>=2.5",
+	"docutils<0.18",
 	"sphinx>=3.2.1",
 	"sphinx-rtd-theme>=0.5.0"
     ],