diff --git a/aiosnow/models/attachment/model.py b/aiosnow/models/attachment/model.py
index ad9cb3d..a04a284 100644
--- a/aiosnow/models/attachment/model.py
+++ b/aiosnow/models/attachment/model.py
@@ -1,7 +1,7 @@
 import asyncio
 from concurrent.futures import ThreadPoolExecutor
 from mimetypes import guess_type
-from typing import Union
+from typing import Union, Any
 
 from aiosnow.query import Condition, Selector
 from aiosnow.request import Response, methods
@@ -11,22 +11,20 @@
 from .schema import AttachmentModelSchema
 
 
-class AttachmentModel(BaseTableModel):
+class AttachmentModel(BaseTableModel, AttachmentModelSchema):
     """Attachment API Model"""
 
-    schema_cls = AttachmentModelSchema
-
-    def __init__(self, *args, **kwargs):
+    def __init__(self, *args: Any, **kwargs: Any):
         self.io_pool_exc = ThreadPoolExecutor(max_workers=10)
         self.loop = asyncio.get_running_loop()
         super(AttachmentModel, self).__init__(*args, **kwargs)
 
-    async def create(self, *_) -> None:
+    async def create(self, payload: dict) -> Response:
         raise AttributeError(
             "Attachment doesn't support create(), use upload() instead"
         )
 
-    async def update(self, *_) -> None:
+    async def update(self, selection: Union[Condition, str], payload: dict) -> Response:
         raise AttributeError("Attachment doesn't support update()")
 
     @property
diff --git a/aiosnow/models/table/model.py b/aiosnow/models/table/model.py
index 6cfb336..f82ce7a 100644
--- a/aiosnow/models/table/model.py
+++ b/aiosnow/models/table/model.py
@@ -5,12 +5,13 @@
 from aiosnow.models.attachment.file import FileHandler
 from aiosnow.query import Condition, Selector
 from aiosnow.request import Response
+from aiosnow.client import Client
 
 from .._base.table import BaseTableModel
 
 
 class TableModel(BaseTableModel):
-    def __init__(self, client, **kwargs):
+    def __init__(self, client: Client, **kwargs: Any):
         self._attachment = AttachmentModel(client, table_name=kwargs.get("table_name"))
         super(TableModel, self).__init__(client, **kwargs)