diff --git a/docs/source/conf.py b/docs/source/conf.py
index 6085b8d..054fdbb 100755
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -38,7 +38,7 @@
   'sphinx.ext.viewcode',
   'sphinx.ext.napoleon',
   'sphinx.ext.mathjax',
-  'm2r2',
+  'm2r',
   'sphinx_rtd_theme',
 ]