diff --git a/qcloud_cos/version.py b/qcloud_cos/version.py
index 47b5ac9..90a3db4 100644
--- a/qcloud_cos/version.py
+++ b/qcloud_cos/version.py
@@ -1 +1 @@
-__version__ = '5.1.9.28'
+__version__ = '5.1.9.29'
diff --git a/setup.py b/setup.py
index 2bfb86c..116a298 100644
--- a/setup.py
+++ b/setup.py
@@ -33,7 +33,7 @@ def long_description():
 
 setup(
     name='cos-python-sdk-v5',
-    version='1.9.28',
+    version='1.9.29',
     url='https://www.qcloud.com/',
     license='MIT',
     author='tiedu, lewzylu, channingliu',
diff --git a/ut/test.py b/ut/test.py
index f085e0d..8f65507 100644
--- a/ut/test.py
+++ b/ut/test.py
@@ -779,7 +779,10 @@ def test_get_service():
     from datetime import datetime
     marker = ""
     list_over = False
+    max_count = 3000
     while list_over is False:
+        if max_count <= 0:
+            break
         create_time = 1514736000
         response = client.list_buckets(
             Region='ap-beijing', CreateTime=create_time, Range='gt', Marker=marker)
@@ -788,6 +791,7 @@ def test_get_service():
                 bucket['CreationDate'], '%Y-%m-%dT%H:%M:%SZ').timetuple()))
             assert ctime > create_time
             assert bucket['Location'] == 'ap-beijing'
+            max_count -= 1
 
         marker = response['Marker']
         if response['IsTruncated'] == 'false':