diff --git a/Lib/unittest/mock.py b/Lib/unittest/mock.py
index cd5a2aeb608..5622917dc37 100644
--- a/Lib/unittest/mock.py
+++ b/Lib/unittest/mock.py
@@ -23,8 +23,6 @@ __all__ = (
 )
 
 
-__version__ = '1.0'
-
 import asyncio
 import contextlib
 import io