diff --git a/matter_server/server/server.py b/matter_server/server/server.py
index 0e5315f2..e80c1aac 100644
--- a/matter_server/server/server.py
+++ b/matter_server/server/server.py
@@ -10,7 +10,7 @@
 import os
 from pathlib import Path
 import traceback
-from typing import TYPE_CHECKING, Any, cast
+from typing import TYPE_CHECKING, Any
 import weakref
 
 from aiohttp import web
@@ -293,8 +293,6 @@ def scope_ipv6_lla(self, ip_addr: str) -> str:
         if not ip_addr_parsed.is_link_local or ip_addr_parsed.version != 6:
             return ip_addr
 
-        ip_addr_parsed = cast(ipaddress.IPv6Address, ip_addr_parsed)
-
         if ip_addr_parsed.scope_id is not None:
             # This type of IPv6 manipulation is not supported by the ipaddress lib
             ip_addr = ip_addr.split("%", maxsplit=1)[0]
diff --git a/pyproject.toml b/pyproject.toml
index 3776da80..c06f0722 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -44,7 +44,7 @@ test = [
   "aioresponses==0.7.8",
   "codespell==2.4.2",
   "isort==8.0.1",
-  "mypy==1.20.1",
+  "mypy==1.20.2",
   "pre-commit==4.6.0",
   "pre-commit-hooks==6.0.0",
   "pylint==4.0.5",