diff --git a/apns2/client.py b/apns2/client.py
index 7774240..baacd61 100644
--- a/apns2/client.py
+++ b/apns2/client.py
@@ -40,7 +40,7 @@ logger = logging.getLogger(__name__)
 
 
 class APNsClient(object):
-    SANDBOX_SERVER = 'api.sandbox.push.apple.com'
+    SANDBOX_SERVER = 'api.development.push.apple.com'
     LIVE_SERVER = 'api.push.apple.com'
 
     DEFAULT_PORT = 443