diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index b28207b..5dad849 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -31,7 +31,7 @@ repos:
         language: python
         additional_dependencies: [pygments, restructuredtext_lint]
 -   repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.19.1
+    rev: v1.20.0
     hooks:
     -   id: mypy
         files: ^(src/)
diff --git a/src/oop_ext/foundation/callback/_callback.py b/src/oop_ext/foundation/callback/_callback.py
index b7c0329..08fc16c 100644
--- a/src/oop_ext/foundation/callback/_callback.py
+++ b/src/oop_ext/foundation/callback/_callback.py
@@ -55,7 +55,6 @@ def on_x(x: int) -> None:
 from typing import Optional
 from typing import Tuple
 from typing import Union
-from typing import cast
 
 import attr
 import functools
@@ -189,7 +188,6 @@ def _GetKey(
         is garbage collected, a new function may end up having the same key.
         """
         if func.__class__ == _CallbackWrapper:
-            func = cast(_CallbackWrapper, func)
             func = func.OriginalMethod()
 
         try:
@@ -224,7 +222,6 @@ def _GetInfo(
         # at this point, but if it's a WeakMethodProxy, register the original method (we'll make a
         # weak reference later anyways).
         if func.__class__ == WeakMethodProxy:
-            func = cast(WeakMethodProxy, func)
             func = func.GetWrappedFunction()
 
         if _IsCallableObject(func):