diff --git a/docs/conf.py b/docs/conf.py
index eb628ff2..acfd79a5 100755
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -25,7 +25,7 @@
 
 # If your documentation needs a minimal Sphinx version, state it here.
 #
-needs_sphinx = '1.4'
+needs_sphinx = '2.1'
 
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom