diff --git a/src/cloudforet/cost_analysis/manager/cost_manager.py b/src/cloudforet/cost_analysis/manager/cost_manager.py
index 842064c..6f76794 100644
--- a/src/cloudforet/cost_analysis/manager/cost_manager.py
+++ b/src/cloudforet/cost_analysis/manager/cost_manager.py
@@ -3,7 +3,7 @@
 import logging
 import time
 from datetime import datetime, timezone
-from typing import Union
+from typing import Union, Generator, Any
 
 import pandas as pd
 from spaceone.core.error import *