diff --git a/minio_storage/files.py b/minio_storage/files.py
index 880aa67..317ed13 100644
--- a/minio_storage/files.py
+++ b/minio_storage/files.py
@@ -64,7 +64,8 @@ def __init__(
             self.max_memory_size = max_memory_size
         super().__init__(name, mode, storage)
 
-    def _get_file(self):
+    @property
+    def file(self):
         if self._file is None:
             try:
                 obj = self._storage.client.get_object(
@@ -82,11 +83,10 @@ def _get_file(self):
                     logger.error(str(e))
         return self._file
 
+    @file.setter
     def _set_file(self, value):
         self._file = value
 
-    file = property(_get_file, _set_file)
-
     def close(self):
         try:
             self.file.close()
@@ -116,7 +116,8 @@ def __init__(
             self.max_memory_size = max_memory_size
         super().__init__(name, mode, storage)
 
-    def _get_file(self):
+    @property
+    def file(self):
         if self._file is None:
             try:
                 obj = self._storage.client.get_object(
@@ -138,11 +139,10 @@ def _get_file(self):
                     logger.error(str(e))
         return self._file
 
+    @file.setter
     def _set_file(self, value):
         self._file = value
 
-    file = property(_get_file, _set_file)
-
     def close(self):
         if self._file is not None:
             self._file.close()
diff --git a/minio_storage/management/commands/minio.py b/minio_storage/management/commands/minio.py
index feba4f9..85673c2 100644
--- a/minio_storage/management/commands/minio.py
+++ b/minio_storage/management/commands/minio.py
@@ -1,6 +1,7 @@
 import argparse
 import json
 import sys
+import typing as T
 from string import Template
 from unittest.mock import patch
 
@@ -162,7 +163,7 @@ def bucket_list(
         list_dirs: bool,
         list_files: bool,
         recursive: bool,
-        format: str = None,
+        format: T.Optional[str] = None,
         summary: bool = True,
     ):
         try:
diff --git a/pyrightconfig.json b/pyrightconfig.json
index 6e0e64f..588000c 100644
--- a/pyrightconfig.json
+++ b/pyrightconfig.json
@@ -8,11 +8,11 @@
   ],
   "reportMissingImports": true,
   "reportMissingTypeStubs": false,
-  "strictParameterNoneValue": false,
-  "reportInvalidStringEscapeSequence": "warning",
-  "reportUnboundVariable": "warning",
-  "reportOptionalMemberAccess": "warning",
-  "reportOptionalIterable": "warning",
+  "strictParameterNoneValue": true,
+  "reportInvalidStringEscapeSequence": "error",
+  "reportUnboundVariable": "error",
+  "reportOptionalMemberAccess": "error",
+  "reportOptionalIterable": "error",
   "pythonVersion": "3.8",
   "pythonPlatform": "Linux"
 }
diff --git a/tox.ini b/tox.ini
index b45cce3..8792aae 100644
--- a/tox.ini
+++ b/tox.ini
@@ -52,6 +52,7 @@ depends=py311-django42-minioknown
 basepython = python3
 deps =
         pyright
+        django-stubs==4.2.0
         -rdev-requirements.txt
 commands =
     pyright --skipunannotated --level WARNING