diff --git a/sdk/request_utils/rest_client.py b/sdk/request_utils/rest_client.py
index 2cf3a70..5fa670d 100644
--- a/sdk/request_utils/rest_client.py
+++ b/sdk/request_utils/rest_client.py
@@ -122,9 +122,10 @@ def start(self, n: int = 3):
 
     def stop(self):
         """
-        Stop rest client immediately.
+        Stop rest client immediately and close pools.
         """
         self._active = False
+        self._pool.close()
 
     def join(self):
         """