diff --git a/aiogram/webhook/aiohttp_server.py b/aiogram/webhook/aiohttp_server.py
index 7a60c06d..029c5771 100644
--- a/aiogram/webhook/aiohttp_server.py
+++ b/aiogram/webhook/aiohttp_server.py
@@ -8,7 +8,7 @@ from aiohttp import MultipartWriter, web
 from aiohttp.abc import Application
 from aiohttp.typedefs import Handler
 from aiohttp.web_middlewares import middleware
-from pydantic_core import from_json, to_json
+from pydantic_core import from_json
 
 from aiogram import Bot, Dispatcher, loggers
 from aiogram.client.form import extract_files, form_serialize
@@ -146,7 +146,7 @@ class BaseRequestHandler(ABC):
         )
         self._background_feed_update_tasks.add(feed_update_task)
         feed_update_task.add_done_callback(self._background_feed_update_tasks.discard)
-        return web.json_response({})  # TODO
+        return web.json_response({}, dumps=form_serialize)
 
     def _build_response_writer(
         self, bot: Bot, result: Optional[TelegramMethod[TelegramType]]
diff --git a/tests/test_api/test_methods/test_base.py b/tests/test_api/test_methods/test_base.py
index 07dedc77..ac71eb22 100644
--- a/tests/test_api/test_methods/test_base.py
+++ b/tests/test_api/test_methods/test_base.py
@@ -20,12 +20,12 @@ class TestTelegramMethodRemoveUnset:
     )
     @pytest.mark.parametrize("obj", [TelegramMethod, TelegramObject])
     def test_remove_unset(self, values, names, obj):
-        validated = obj.remove_unset.wrapped(values)
+        validated = obj.remove_unset(values)
         assert set(validated.keys()) == names
 
     @pytest.mark.parametrize("obj", [TelegramMethod, TelegramObject])
     def test_remove_unset_non_dict(self, obj):
-        assert obj.remove_unset.wrapped("") == ""
+        assert obj.remove_unset("") == ""
 
 
 class TestTelegramMethodModelDumpJson: