diff --git a/py/pyproject.toml b/py/pyproject.toml
index 8a8d4a950b3a7..4b0080a95afa5 100644
--- a/py/pyproject.toml
+++ b/py/pyproject.toml
@@ -125,11 +125,10 @@ warn_unused_ignores = true
 # warns when returning a value with typing.Any from a function with a non typing.Any return type.
 warn_return_any = false
 # Shows a warning when encountering any code inferred to be unreachable after performing type analysis.
-warn_unreachable = false
+warn_unreachable = true
 
 [[tool.mypy.overrides]]
 module = [
-    "selenium.webdriver.common.devtools.*",
     "selenium.webdriver.common.bidi.*",
 ]
 ignore_errors = true
diff --git a/py/selenium/webdriver/common/_bidi/serialization.py b/py/selenium/webdriver/common/_bidi/serialization.py
index 84d251da857eb..09b0984bd3006 100644
--- a/py/selenium/webdriver/common/_bidi/serialization.py
+++ b/py/selenium/webdriver/common/_bidi/serialization.py
@@ -291,7 +291,7 @@ def as_json(self) -> dict:
         return payload
 
     @classmethod
-    def from_json(cls, payload: dict) -> Any:
+    def from_json(cls, payload: Any) -> Any:
         if not isinstance(payload, dict):
             got = type(payload).__name__
             raise BiDiSerializationError(f"{cls.__name__} expected an object on the wire, got {got} {payload!r}")
diff --git a/py/selenium/webdriver/common/actions/pointer_input.py b/py/selenium/webdriver/common/actions/pointer_input.py
index 448b2c6b18390..d4d1fb837f397 100644
--- a/py/selenium/webdriver/common/actions/pointer_input.py
+++ b/py/selenium/webdriver/common/actions/pointer_input.py
@@ -39,7 +39,7 @@ def create_pointer_move(
         duration=DEFAULT_MOVE_DURATION,
         x: float = 0,
         y: float = 0,
-        origin: WebElement | None = None,
+        origin: WebElement | str | None = None,
         **kwargs,
     ):
         action = {"type": "pointerMove", "duration": duration, "x": x, "y": y, **kwargs}
diff --git a/py/selenium/webdriver/common/proxy.py b/py/selenium/webdriver/common/proxy.py
index eadf1d069709f..5cc34c0c7bf14 100644
--- a/py/selenium/webdriver/common/proxy.py
+++ b/py/selenium/webdriver/common/proxy.py
@@ -74,16 +74,16 @@ def __set__(self, obj, value):
 class Proxy:
     """Proxy configuration containing proxy type and necessary proxy settings."""
 
-    proxyType = ProxyType.UNSPECIFIED
-    autodetect = False
-    httpProxy = ""
-    noProxy = ""
-    proxyAutoconfigUrl = ""
-    sslProxy = ""
-    socksProxy = ""
-    socksUsername = ""
-    socksPassword = ""
-    socksVersion = None
+    proxyType: dict = ProxyType.UNSPECIFIED
+    autodetect: bool = False
+    httpProxy: str = ""
+    noProxy: str | list[str] = ""
+    proxyAutoconfigUrl: str = ""
+    sslProxy: str = ""
+    socksProxy: str = ""
+    socksUsername: str = ""
+    socksPassword: str = ""
+    socksVersion: int | None = None
 
     # create descriptor type objects
     auto_detect = _ProxyTypeDescriptor("autodetect", ProxyType.AUTODETECT)
diff --git a/py/selenium/webdriver/common/service.py b/py/selenium/webdriver/common/service.py
index fa53be3988fe9..42c94ea12147e 100644
--- a/py/selenium/webdriver/common/service.py
+++ b/py/selenium/webdriver/common/service.py
@@ -22,7 +22,6 @@
 import sys
 from abc import ABC, abstractmethod
 from collections.abc import Mapping
-from io import IOBase
 from subprocess import PIPE
 from time import sleep
 from typing import IO, Any
@@ -156,10 +155,10 @@ def send_remote_shutdown_command(self) -> None:
     def stop(self) -> None:
         """Stops the service."""
         if self.log_output not in {PIPE, subprocess.DEVNULL}:
-            if isinstance(self.log_output, IOBase) and self._owns_log_output:
-                self.log_output.close()
-            elif isinstance(self.log_output, int):
+            if isinstance(self.log_output, int):
                 os.close(self.log_output)
+            elif self.log_output is not None and self._owns_log_output:
+                self.log_output.close()
         if self.process is not None:
             try:
                 if self.process.poll() is None:
diff --git a/py/selenium/webdriver/firefox/options.py b/py/selenium/webdriver/firefox/options.py
index ef3afe546fb91..598673fcfc915 100644
--- a/py/selenium/webdriver/firefox/options.py
+++ b/py/selenium/webdriver/firefox/options.py
@@ -24,7 +24,7 @@
 
 class Log:
     def __init__(self) -> None:
-        self.level = None
+        self.level: str | None = None
 
     def to_capabilities(self) -> dict:
         if self.level: