diff --git a/aiohttp_devtools/logs.py b/aiohttp_devtools/logs.py
index 53683d26..3087d528 100644
--- a/aiohttp_devtools/logs.py
+++ b/aiohttp_devtools/logs.py
@@ -80,7 +80,7 @@ def formatMessage(self, record: logging.LogRecord) -> str:
 
     def formatException(self, ei: _Ei) -> str:
         sio = StringIO()
-        traceback.print_exception(*ei, file=sio)  # type: ignore[misc]
+        traceback.print_exception(*ei, file=sio)
         stack = sio.getvalue()
         sio.close()
         if self.stream_is_tty and pyg_lexer:
diff --git a/aiohttp_devtools/runserver/serve.py b/aiohttp_devtools/runserver/serve.py
index 353bcce2..f5c36c2c 100644
--- a/aiohttp_devtools/runserver/serve.py
+++ b/aiohttp_devtools/runserver/serve.py
@@ -3,9 +3,10 @@
 import json
 import mimetypes
 import sys
+import warnings
 from errno import EADDRINUSE
 from pathlib import Path
-from typing import Any, Iterator, Optional, NoReturn
+from typing import Any, Iterator, NoReturn, Optional, Set, Tuple
 
 from aiohttp import WSMsgType, web
 from aiohttp.hdrs import LAST_MODIFIED, CONTENT_LENGTH
@@ -23,19 +24,37 @@
 from .log_handlers import AccessLogger
 from .utils import MutableValue
 
+try:
+    from aiohttp_jinja2 import static_root_key
+except ImportError:
+    static_root_key = None
+
 LIVE_RELOAD_HOST_SNIPPET = '\n<script src="http://{}:{}/livereload.js"></script>\n'
 LIVE_RELOAD_LOCAL_SNIPPET = b'\n<script src="/livereload.js"></script>\n'
 HOST = '0.0.0.0'
 
+LIVERELOAD_SCRIPT = web.AppKey("LIVERELOAD_SCRIPT", bytes)
+STATIC_PATH = web.AppKey("STATIC_PATH", str)
+STATIC_URL = web.AppKey("STATIC_URL", str)
+WS = web.AppKey("WS", Set[Tuple[web.WebSocketResponse, str]])
+
 
 def _set_static_url(app: web.Application, url: str) -> None:
-    app["static_root_url"] = MutableValue(url)
+    if static_root_key is None:  # TODO: Remove fallback
+        with warnings.catch_warnings():
+            app["static_root_url"] = MutableValue(url)
+    else:
+        app[static_root_key] = MutableValue(url)
     for subapp in app._subapps:
         _set_static_url(subapp, url)
 
 
 def _change_static_url(app: web.Application, url: str) -> None:
-    app["static_root_url"].change(url)
+    if static_root_key is None:  # TODO: Remove fallback
+        with warnings.catch_warnings():
+            app["static_root_url"].change(url)
+    else:
+        app[static_root_key].change(url)
     for subapp in app._subapps:
         _change_static_url(subapp, url)
 
@@ -174,23 +193,20 @@ async def create_main_app(config: Config, app_factory: AppFactory) -> web.AppRun
     modify_main_app(app, config)
 
     await check_port_open(config.main_port)
-    return web.AppRunner(app, access_log_class=AccessLogger)
+    return web.AppRunner(app, access_log_class=AccessLogger, shutdown_timeout=0.1)
 
 
 async def start_main_app(runner: web.AppRunner, port: int) -> None:
     await runner.setup()
-    site = web.TCPSite(runner, host=HOST, port=port, shutdown_timeout=0.1)
+    site = web.TCPSite(runner, host=HOST, port=port)
     await site.start()
 
 
-WS = 'websockets'
-
-
 async def src_reload(app: web.Application, path: Optional[str] = None) -> int:
     """
     prompt each connected browser to reload by sending websocket message.
 
-    :param path: if supplied this must be a path relative to app['static_path'],
+    :param path: if supplied this must be a path relative to `static_path`,
         eg. reload of a single file is only supported for static resources.
     :return: number of sources reloaded
     """
@@ -200,7 +216,7 @@ async def src_reload(app: web.Application, path: Optional[str] = None) -> int:
 
     is_html = None
     if path:
-        path = str(Path(app['static_url']) / Path(path).relative_to(app['static_path']))
+        path = str(Path(app[STATIC_URL]) / Path(path).relative_to(app[STATIC_PATH]))
         is_html = mimetypes.guess_type(path)[0] == 'text/html'
 
     reloads = 0
@@ -239,16 +255,15 @@ def create_auxiliary_app(
         *, static_path: Optional[str], static_url: str = "/", livereload: bool = True,
         browser_cache: bool = False) -> web.Application:
     app = web.Application()
-    app[WS] = set()
-    app.update(
-        static_path=static_path,
-        static_url=static_url,
-    )
+    ws: Set[Tuple[web.WebSocketResponse, str]] = set()
+    app[STATIC_PATH] = static_path or ""
+    app[STATIC_URL] = static_url
+    app[WS] = ws
     app.on_shutdown.append(cleanup_aux_app)
 
     if livereload:
         lr_path = Path(__file__).resolve().parent / 'livereload.js'
-        app['livereload_script'] = lr_path.read_bytes()
+        app[LIVERELOAD_SCRIPT] = lr_path.read_bytes()
         app.router.add_route('GET', '/livereload.js', livereload_js)
         app.router.add_route('GET', '/livereload', websocket_handler)
         aux_logger.debug('enabling livereload on auxiliary app')
@@ -271,7 +286,7 @@ async def livereload_js(request: web.Request) -> web.Response:
     if request.if_modified_since:
         raise HTTPNotModified()
 
-    lr_script = request.app['livereload_script']
+    lr_script = request.app[LIVERELOAD_SCRIPT]
     return web.Response(body=lr_script, content_type='application/javascript',
                         headers={LAST_MODIFIED: 'Fri, 01 Jan 2016 00:00:00 GMT'})
 
diff --git a/aiohttp_devtools/runserver/watch.py b/aiohttp_devtools/runserver/watch.py
index be4e3a4a..fc8029af 100644
--- a/aiohttp_devtools/runserver/watch.py
+++ b/aiohttp_devtools/runserver/watch.py
@@ -14,7 +14,7 @@
 from ..exceptions import AiohttpDevException
 from ..logs import rs_dft_logger as logger
 from .config import Config
-from .serve import WS, serve_main_app, src_reload
+from .serve import STATIC_PATH, WS, serve_main_app, src_reload
 
 
 class WatchTask:
@@ -64,7 +64,7 @@ async def _run(self, live_checks: int = 150) -> None:
         try:
             self._start_dev_server()
 
-            static_path = str(self._app['static_path'])
+            static_path = self._app[STATIC_PATH]
 
             def is_static(changes: Iterable[Tuple[object, str]]) -> bool:
                 return all(str(c[1]).startswith(static_path) for c in changes)
diff --git a/requirements.txt b/requirements.txt
index c1777a07..163d153a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 aiohttp==3.8.5
+aiohttp-jinja2==1.6
 click==8.1.7
 coverage==7.3.2
 devtools==0.12.2
diff --git a/setup.py b/setup.py
index 298ec0bf..b0ba738d 100644
--- a/setup.py
+++ b/setup.py
@@ -63,7 +63,7 @@
         aiohttp-devtools=aiohttp_devtools.cli:cli
     """,
     install_requires=[
-        'aiohttp>=3.8.0',
+        'aiohttp>=3.9',
         'click>=6.6',
         'devtools>=0.6',
         'Pygments>=2.2.0',
diff --git a/tests/test_runserver_main.py b/tests/test_runserver_main.py
index e1581ef0..2a826c84 100644
--- a/tests/test_runserver_main.py
+++ b/tests/test_runserver_main.py
@@ -9,8 +9,8 @@
 
 from aiohttp_devtools.runserver import runserver
 from aiohttp_devtools.runserver.config import Config
-from aiohttp_devtools.runserver.serve import (create_auxiliary_app, create_main_app, modify_main_app, src_reload,
-                                              start_main_app)
+from aiohttp_devtools.runserver.serve import (
+    WS, create_auxiliary_app, create_main_app, modify_main_app, src_reload, start_main_app)
 
 from .conftest import SIMPLE_APP, forked
 
@@ -218,12 +218,12 @@ async def test_websocket_hello(aux_cli, smart_caplog):
 
 
 async def test_websocket_info(aux_cli, event_loop):
-    assert len(aux_cli.server.app['websockets']) == 0
+    assert len(aux_cli.server.app[WS]) == 0
     ws = await aux_cli.session.ws_connect(aux_cli.make_url('/livereload'))
     try:
         await ws.send_json({'command': 'info', 'url': 'foobar', 'plugins': 'bang'})
         await asyncio.sleep(0.05)
-        assert len(aux_cli.server.app['websockets']) == 1
+        assert len(aux_cli.server.app[WS]) == 1
     finally:
         await ws.close()
 
diff --git a/tests/test_runserver_serve.py b/tests/test_runserver_serve.py
index dadeb7dc..31feb315 100644
--- a/tests/test_runserver_serve.py
+++ b/tests/test_runserver_serve.py
@@ -6,12 +6,15 @@
 
 import pytest
 from aiohttp.web import Application, Request, Response
+from aiohttp_jinja2 import static_root_key
 from pytest_toolbox import mktree
 
 from aiohttp_devtools.exceptions import AiohttpDevException
 from aiohttp_devtools.runserver.config import Config
 from aiohttp_devtools.runserver.log_handlers import fmt_size
-from aiohttp_devtools.runserver.serve import check_port_open, cleanup_aux_app, modify_main_app, src_reload
+from aiohttp_devtools.runserver.serve import (
+    STATIC_PATH, STATIC_URL, WS, check_port_open, cleanup_aux_app,
+    modify_main_app, src_reload)
 
 from .conftest import SIMPLE_APP, create_future
 
@@ -33,11 +36,9 @@ async def test_aux_reload(smart_caplog):
     aux_app = Application()
     ws = MagicMock()
     ws.send_str = MagicMock(return_value=create_future())
-    aux_app.update(
-        websockets=[(ws, '/foo/bar')],
-        static_url='/static/',
-        static_path='/path/to/static_files/'
-    )
+    aux_app[STATIC_PATH] = "/path/to/static_files/"
+    aux_app[STATIC_URL] = "/static/"
+    aux_app[WS] = set(((ws, '/foo/bar'),))  # type: ignore[misc]
     assert 1 == await src_reload(aux_app, '/path/to/static_files/the_file.js')
     assert ws.send_str.call_count == 1
     send_obj = json.loads(ws.send_str.call_args[0][0])
@@ -55,11 +56,9 @@ async def test_aux_reload_no_path():
     aux_app = Application()
     ws = MagicMock()
     ws.send_str = MagicMock(return_value=create_future())
-    aux_app.update(
-        websockets=[(ws, '/foo/bar')],
-        static_url='/static/',
-        static_path='/path/to/static_files/'
-    )
+    aux_app[STATIC_PATH] = "/path/to/static_files/"
+    aux_app[STATIC_URL] = "/static/"
+    aux_app[WS] = set(((ws, '/foo/bar'),))  # type: ignore[misc]
     assert 1 == await src_reload(aux_app)
     assert ws.send_str.call_count == 1
     send_obj = json.loads(ws.send_str.call_args[0][0])
@@ -75,11 +74,9 @@ async def test_aux_reload_html_different():
     aux_app = Application()
     ws = MagicMock()
     ws.send_str = MagicMock(return_value=create_future())
-    aux_app.update(
-        websockets=[(ws, '/foo/bar')],
-        static_url='/static/',
-        static_path='/path/to/static_files/'
-    )
+    aux_app[STATIC_PATH] = "/path/to/static_files/"
+    aux_app[STATIC_URL] = "/static/"
+    aux_app[WS] = set(((ws, '/foo/bar'),))  # type: ignore[misc]
     assert 0 == await src_reload(aux_app, '/path/to/static_files/foo/bar.html')
     assert ws.send_str.call_count == 0
 
@@ -89,11 +86,9 @@ async def test_aux_reload_runtime_error(smart_caplog):
     ws = MagicMock()
     ws.send_str = MagicMock(return_value=create_future())
     ws.send_str = MagicMock(side_effect=RuntimeError('foobar'))
-    aux_app.update(
-        websockets=[(ws, '/foo/bar')],
-        static_url='/static/',
-        static_path='/path/to/static_files/'
-    )
+    aux_app[STATIC_PATH] = "/path/to/static_files/"
+    aux_app[STATIC_URL] = "/static/"
+    aux_app[WS] = set(((ws, '/foo/bar'),))  # type: ignore[misc]
     assert 0 == await src_reload(aux_app)
     assert ws.send_str.call_count == 1
     assert 'adev.server.aux ERROR: Error broadcasting change to /foo/bar, RuntimeError: foobar\n' == smart_caplog
@@ -104,7 +99,7 @@ async def test_aux_cleanup(event_loop):
     aux_app.on_cleanup.append(cleanup_aux_app)
     ws = MagicMock()
     ws.close = MagicMock(return_value=create_future())
-    aux_app['websockets'] = [(ws, '/foo/bar')]
+    aux_app[WS] = set(((ws, '/foo/bar'),))  # type: ignore[misc]
     aux_app.freeze()
     await aux_app.cleanup()
     assert ws.close.call_count == 1
@@ -144,8 +139,8 @@ def test_modify_main_app_all_off(tmpworkdir):
     modify_main_app(app, config)  # type: ignore[arg-type]
     assert len(app.on_response_prepare) == 0
     assert len(app.middlewares) == 0
-    assert app['static_root_url'] == 'http://foobar.com:8001/static'
-    assert subapp["static_root_url"] == "http://foobar.com:8001/static"
+    assert app[static_root_key] == 'http://foobar.com:8001/static'
+    assert subapp[static_root_key] == "http://foobar.com:8001/static"
     assert app._debug is True
 
 
@@ -158,8 +153,8 @@ def test_modify_main_app_all_on(tmpworkdir):
     modify_main_app(app, config)  # type: ignore[arg-type]
     assert len(app.on_response_prepare) == 1
     assert len(app.middlewares) == 2
-    assert app['static_root_url'] == 'http://localhost:8001/static'
-    assert subapp['static_root_url'] == "http://localhost:8001/static"
+    assert app[static_root_key] == 'http://localhost:8001/static'
+    assert subapp[static_root_key] == "http://localhost:8001/static"
     assert app._debug is True
 
 
diff --git a/tests/test_runserver_watch.py b/tests/test_runserver_watch.py
index 4136f379..cf60b895 100644
--- a/tests/test_runserver_watch.py
+++ b/tests/test_runserver_watch.py
@@ -1,10 +1,12 @@
 import asyncio
 from functools import partial
+from typing import Set, Tuple
 from unittest.mock import MagicMock, call
 
 from aiohttp import ClientSession
-from aiohttp.web import Application
+from aiohttp.web import Application, WebSocketResponse
 
+from aiohttp_devtools.runserver.serve import STATIC_PATH, WS
 from aiohttp_devtools.runserver.watch import AppTask, LiveReloadTask
 
 from .conftest import create_future
@@ -39,7 +41,7 @@ async def test_single_file_change(event_loop, mocker):
     stop_mock = mocker.patch.object(app_task, "_stop_dev_server", autospec=True)
     app = MagicMock()
     await app_task.start(app)
-    d = {'static_path': '/path/to/'}
+    d = {STATIC_PATH: "/path/to/"}
     app.__getitem__.side_effect = d.__getitem__
     assert app_task._task is not None
     await app_task._task
@@ -79,13 +81,13 @@ async def test_python_no_server(event_loop, mocker):
     stop_mock = mocker.patch.object(app_task, "_stop_dev_server", autospec=True)
     mocker.patch.object(app_task, "_run", partial(app_task._run, live_checks=2))
     app = Application()
-    app['static_path'] = '/path/to/'
+    app[STATIC_PATH] = "/path/to/"
     app.src_reload = MagicMock()
     mock_ws = MagicMock()
     f: asyncio.Future[int] = asyncio.Future()
     f.set_result(1)
     mock_ws.send_str = MagicMock(return_value=f)
-    app['websockets'] = [(mock_ws, '/')]
+    app[WS] = set(((mock_ws, '/'),))  # type: ignore[misc]
     await app_task.start(app)
     assert app_task._task is not None
     await app_task._task
@@ -98,7 +100,8 @@ async def test_python_no_server(event_loop, mocker):
 
 async def test_reload_server_running(event_loop, aiohttp_client, mocker):
     app = Application()
-    app['websockets'] = [None]
+    ws: Set[Tuple[WebSocketResponse, str]] = set(((MagicMock(), "/foo"),))
+    app[WS] = ws
     mock_src_reload = mocker.patch('aiohttp_devtools.runserver.watch.src_reload', return_value=create_future())
     cli = await aiohttp_client(app)
     config = MagicMock()