diff --git a/.teamcity/requirements.txt b/.teamcity/requirements.txt
index 4cd77073614710e3fd3bd39efdcbf9b0c601e93a..1899a87dcba5505f854acd7b9c69a92a3ac7bb99 100644
--- a/.teamcity/requirements.txt
+++ b/.teamcity/requirements.txt
@@ -1,5 +1,7 @@
 # requirements for unittest
 rarfile==3.1
+opencv-python<=4.3.0.34;python_version>="3"
+opencv-python==4.2.0.32;python_version<"3"
 paddlepaddle-gpu==1.6.1.post97
 gym
 details
diff --git a/parl/remote/tests/log_server_test.py b/parl/remote/tests/log_server_test.py
index 931fc29538df1bc1c960c57e2f97a54e4bb8e0aa..b41fbbd444e2f9602107d2d7b4634c227ad655c8 100644
--- a/parl/remote/tests/log_server_test.py
+++ b/parl/remote/tests/log_server_test.py
@@ -125,10 +125,10 @@ class TestLogServer(unittest.TestCase):
         th.start()
         time.sleep(1)
         # start the cluster monitor
-        monitor_file = __file__.replace(
-            os.path.join('tests', 'log_server_test.pyc'), 'monitor.py')
-        monitor_file = monitor_file.replace(
-            os.path.join('tests', 'log_server_test.py'), 'monitor.py')
+        monitor_file = __file__.replace('log_server_test.pyc', '../monitor.py')
+        monitor_file = monitor_file.replace('log_server_test.py',
+                                            '../monitor.py')
+
         command = [
             sys.executable, monitor_file, "--monitor_port",
             str(monitor_port), "--address", "localhost:" + str(master_port)
diff --git a/setup.py b/setup.py
index 659af892019a5142ad122bf8213f910e3be14483..ddd61cfe4e829f6964be488b2cedc737f1c27bd0 100644
--- a/setup.py
+++ b/setup.py
@@ -82,7 +82,7 @@ setup(
         "click",
         "psutil>=5.6.2",
         "flask_cors",
-        "visualdl>=2.0.0b;python_version>='3' and platform_system=='Linux'",
+        "visualdl>=2.0.0b;python_version>='3.7' and platform_system=='Linux'",
     ],
     classifiers=[
         'Intended Audience :: Developers',