--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -35,7 +35,6 @@ extensions = [
     'sphinx.ext.autodoc',
     'sphinx.ext.doctest',
     'sphinx.ext.intersphinx',
-    'ext.annotate',
 ]
 
 # Add any paths that contain templates here, relative to this directory.