diff --git a/nonebot/adapters/_message.py b/nonebot/adapters/_message.py
index 8232fac4..3ff6e9b9 100644
--- a/nonebot/adapters/_message.py
+++ b/nonebot/adapters/_message.py
@@ -14,7 +14,6 @@ from typing import (
     Tuple,
     Union,
     Generic,
-    Mapping,
     TypeVar,
     Iterable,
     Optional,