diff --git a/onvif/utils/error_handlers.py b/onvif/utils/error_handlers.py
index 213120d0..f63f1c8c 100644
--- a/onvif/utils/error_handlers.py
+++ b/onvif/utils/error_handlers.py
@@ -37,6 +37,8 @@
     - `zeep.exceptions.Fault`: Base SOAP fault exception
 """
 
+from __future__ import annotations
+
 import logging
 from collections.abc import Callable
 from typing import Any
diff --git a/onvif/utils/exceptions.py b/onvif/utils/exceptions.py
index cfbc0589..3e8f4a7d 100644
--- a/onvif/utils/exceptions.py
+++ b/onvif/utils/exceptions.py
@@ -1,5 +1,7 @@
 """ONVIFOperationException: Enhanced exception wrapper for ONVIF operation failures."""
 
+from __future__ import annotations
+
 import requests
 from zeep.exceptions import Fault
 
@@ -86,7 +88,7 @@ class ONVIFOperationException(Exception):
         - `requests.exceptions.RequestException`: Base HTTP error
     """
 
-    def __init__(self, operation, original_exception):
+    def __init__(self, operation: str, original_exception: Exception):
         self.operation = operation
         self.original_exception = original_exception
 
diff --git a/onvif/utils/zeep.py b/onvif/utils/zeep.py
index 2c30a753..847a699c 100644
--- a/onvif/utils/zeep.py
+++ b/onvif/utils/zeep.py
@@ -1,5 +1,7 @@
 """ZeepPatcher: Patch zeep SOAP library to handle ONVIF `xsd:any` fields."""
 
+from __future__ import annotations
+
 import logging
 from collections.abc import Callable
 from typing import Any