diff --git a/photo21/middleware.py b/photo21/middleware.py
index 1c316d8..230e373 100644
--- a/photo21/middleware.py
+++ b/photo21/middleware.py
@@ -42,7 +42,7 @@ class LoginRequiredMiddleware:
         # Check against ranges
         if hasattr(settings, 'LOGIN_EXEMPT_IP_RANGE'):
             for ip_range in settings.LOGIN_EXEMPT_IP_RANGE:
-                net = ip_network(ip_range)
+                net = ipaddress.ip_network(ip_range)
                 if ip in net:
                     return True
         return False