diff --git a/homeassistant/components/hassio/http.py b/homeassistant/components/hassio/http.py
index 84b49af11c2..0d23a953128 100644
--- a/homeassistant/components/hassio/http.py
+++ b/homeassistant/components/hassio/http.py
@@ -157,7 +157,7 @@ class HassIOView(HomeAssistantView):
                 if path == "backups/new/upload":
                     # We need to reuse the full content type that includes the boundary
                     # pylint: disable-next=protected-access
-                    headers[CONTENT_TYPE] = request._stored_content_type  # type: ignore[assignment]
+                    headers[CONTENT_TYPE] = request._stored_content_type
 
         try:
             client = await self._websession.request(
diff --git a/homeassistant/helpers/aiohttp_client.py b/homeassistant/helpers/aiohttp_client.py
index 1948d3bca95..20351efff53 100644
--- a/homeassistant/helpers/aiohttp_client.py
+++ b/homeassistant/helpers/aiohttp_client.py
@@ -4,6 +4,7 @@ from __future__ import annotations
 import asyncio
 from collections.abc import Awaitable, Callable
 from contextlib import suppress
+from ssl import SSLContext
 import sys
 from types import MappingProxyType
 from typing import TYPE_CHECKING, Any, cast
@@ -65,8 +66,10 @@ async def _noop_wait(*args: Any, **kwargs: Any) -> None:
     return
 
 
-# pylint: disable-next=protected-access
-web.BaseSite._wait = _noop_wait  # type: ignore[method-assign]
+# TODO: Remove version check with aiohttp 3.9.0  # pylint: disable=fixme
+if sys.version_info >= (3, 12):
+    # pylint: disable-next=protected-access
+    web.BaseSite._wait = _noop_wait  # type: ignore[method-assign]
 
 
 class HassClientResponse(aiohttp.ClientResponse):
@@ -286,7 +289,7 @@ def _async_get_connector(
         return cast(aiohttp.BaseConnector, hass.data[key])
 
     if verify_ssl:
-        ssl_context = ssl_util.get_default_context()
+        ssl_context: bool | SSLContext = ssl_util.get_default_context()
     else:
         ssl_context = ssl_util.get_default_no_verify_context()
 
diff --git a/homeassistant/package_constraints.txt b/homeassistant/package_constraints.txt
index d9f493ce723..2a5ed1274b2 100644
--- a/homeassistant/package_constraints.txt
+++ b/homeassistant/package_constraints.txt
@@ -1,5 +1,6 @@
 aiodiscover==1.5.1
-aiohttp==3.9.0b0
+aiohttp==3.8.5;python_version<'3.12'
+aiohttp==3.9.0b0;python_version>='3.12'
 aiohttp_cors==0.7.0
 astral==2.2
 async-upnp-client==0.36.1
diff --git a/pyproject.toml b/pyproject.toml
index 508b2c06b9e..5cc122850ac 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,8 @@ classifiers = [
 ]
 requires-python = ">=3.11.0"
 dependencies    = [
-    "aiohttp==3.9.0b0",
+    "aiohttp==3.9.0b0;python_version>='3.12'",
+    "aiohttp==3.8.5;python_version<'3.12'",
     "astral==2.2",
     "attrs==23.1.0",
     "atomicwrites-homeassistant==1.4.1",
diff --git a/requirements.txt b/requirements.txt
index 3d64dbe69ff..e6359a6bfd1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,8 @@
 -c homeassistant/package_constraints.txt
 
 # Home Assistant Core
-aiohttp==3.9.0b0
+aiohttp==3.9.0b0;python_version>='3.12'
+aiohttp==3.8.5;python_version<'3.12'
 astral==2.2
 attrs==23.1.0
 atomicwrites-homeassistant==1.4.1
diff --git a/tests/components/generic/test_camera.py b/tests/components/generic/test_camera.py
index 8bfd0a66dd5..aecfcbc29c1 100644
--- a/tests/components/generic/test_camera.py
+++ b/tests/components/generic/test_camera.py
@@ -1,6 +1,7 @@
 """The tests for generic camera component."""
 import asyncio
 from http import HTTPStatus
+import sys
 from unittest.mock import patch
 
 import aiohttp
@@ -163,10 +164,17 @@ async def test_limit_refetch(
 
     hass.states.async_set("sensor.temp", "5")
 
-    with pytest.raises(aiohttp.ServerTimeoutError), patch(
-        "asyncio.timeout", side_effect=asyncio.TimeoutError()
-    ):
-        resp = await client.get("/api/camera_proxy/camera.config_test")
+    # TODO: Remove version check with aiohttp 3.9.0
+    if sys.version_info >= (3, 12):
+        with pytest.raises(aiohttp.ServerTimeoutError), patch(
+            "asyncio.timeout", side_effect=asyncio.TimeoutError()
+        ):
+            resp = await client.get("/api/camera_proxy/camera.config_test")
+    else:
+        with pytest.raises(aiohttp.ServerTimeoutError), patch(
+            "async_timeout.timeout", side_effect=asyncio.TimeoutError()
+        ):
+            resp = await client.get("/api/camera_proxy/camera.config_test")
 
     assert respx.calls.call_count == 1
     assert resp.status == HTTPStatus.OK
diff --git a/tests/util/test_aiohttp.py b/tests/util/test_aiohttp.py
index 496e6373ba5..bfdc3c3e949 100644
--- a/tests/util/test_aiohttp.py
+++ b/tests/util/test_aiohttp.py
@@ -1,4 +1,6 @@
 """Test aiohttp request helper."""
+import sys
+
 from aiohttp import web
 
 from homeassistant.util import aiohttp
@@ -48,11 +50,22 @@ def test_serialize_text() -> None:
 def test_serialize_body_str() -> None:
     """Test serializing a response with a str as body."""
     response = web.Response(status=201, body="Hello")
-    assert aiohttp.serialize_response(response) == {
-        "status": 201,
-        "body": "Hello",
-        "headers": {"Content-Type": "text/plain; charset=utf-8"},
-    }
+    # TODO: Remove version check with aiohttp 3.9.0
+    if sys.version_info >= (3, 12):
+        assert aiohttp.serialize_response(response) == {
+            "status": 201,
+            "body": "Hello",
+            "headers": {"Content-Type": "text/plain; charset=utf-8"},
+        }
+    else:
+        assert aiohttp.serialize_response(response) == {
+            "status": 201,
+            "body": "Hello",
+            "headers": {
+                "Content-Length": "5",
+                "Content-Type": "text/plain; charset=utf-8",
+            },
+        }
 
 
 def test_serialize_body_None() -> None: