diff --git a/setup.py b/setup.py
index f56b68d..4bf709c 100644
--- a/setup.py
+++ b/setup.py
@@ -34,7 +34,7 @@ setup(
         'futures>=3.2.0',
         'incf.countryutils>=1.0',
         'ipaddress>=1.0.22',
-        'natsort>=5.2.0',
+        'natsort>=5.2.0,<5.3',
         # botocore doesn't like >=2.7.0 for some reason
         'python-dateutil>=2.6.0,<2.7.0',
         'requests>=2.18.4'