diff --git a/setup.py b/setup.py
index 5727bd0..c2042ea 100644
--- a/setup.py
+++ b/setup.py
@@ -38,7 +38,7 @@ extras_require = {
         'pymysql',
         'flake8>=2.4.0',
         'isort==3.9.6',
-        'natsort==3.5.6',
+        'natsort==4.0.1',
     ],
     'anyjson': ['anyjson>=0.3.3'],
     'babel': ['Babel>=1.3'],