diff --git a/doc/conf.py b/doc/conf.py
index 05755cc..a71f837 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -38,7 +38,7 @@ extensions = [
     'sphinx.ext.autodoc',
     'sphinx.ext.intersphinx',
     'sphinx.ext.viewcode',
-    'sphinxcontrib.napoleon',
+    'sphinx.ext.napoleon',
 ]
 
 # Add any paths that contain templates here, relative to this directory.
diff --git a/tools/doc-requires b/tools/doc-requires
index 6feaa3a..0c74084 100644
--- a/tools/doc-requires
+++ b/tools/doc-requires
@@ -2,6 +2,5 @@ docutils
 jinja2
 markupsafe
 pygments
-sphinx
-sphinxcontrib-napoleon
+sphinx>=1.4.4
 sphinx_rtd_theme