diff --git a/dingtalk_stream/stream.py b/dingtalk_stream/stream.py
index 1b34d6f..91dc243 100644
--- a/dingtalk_stream/stream.py
+++ b/dingtalk_stream/stream.py
@@ -163,7 +163,7 @@ def open_connection(self):
             'clientId': self.credential.client_id,
             'clientSecret': self.credential.client_secret,
             'subscriptions': topics,
-            'ua': 'dingtalk-sdk-python/v%s' % VERSION_STRING,
+            'ua': 'dingtalk-sdk-python/v%s-union' % VERSION_STRING,
             'localIp': self.get_host_ip()
         }).encode('utf-8')
 
diff --git a/dingtalk_stream/version.py b/dingtalk_stream/version.py
index 5856c71..d14dfec 100644
--- a/dingtalk_stream/version.py
+++ b/dingtalk_stream/version.py
@@ -1 +1 @@
-VERSION_STRING = '0.24.2'
+VERSION_STRING = '0.24.3'