diff --git a/src/line_notifier.py b/src/line_notifier.py
index 4ac5da0..e5e6437 100644
--- a/src/line_notifier.py
+++ b/src/line_notifier.py
@@ -2,7 +2,7 @@
 
 import os
 from io import BytesIO
-from typing import Optional
+from typing import TypedDict, Optional
 
 import numpy as np
 import requests