diff --git a/arduino_iot_cloud/ucloud.py b/arduino_iot_cloud/ucloud.py
index 8081941..d4f817c 100644
--- a/arduino_iot_cloud/ucloud.py
+++ b/arduino_iot_cloud/ucloud.py
@@ -43,10 +43,10 @@ class InvalidStateError(Exception):
         pass
 
 # Server/port for basic auth.
-_DEFAULT_UP_SERVER = ("mqtts-up.iot.oniudra.cc", 8884)
+_DEFAULT_UP_SERVER = ("mqtts-up.iot.arduino.cc", 8884)
 
 # Default server/port for key/cert auth.
-_DEFAULT_SA_SERVER = ("mqtts-sa.iot.oniudra.cc", 8883)
+_DEFAULT_SA_SERVER = ("mqtts-sa.iot.arduino.cc", 8883)
 
 
 def timestamp():