diff --git a/homeassistant/components/hassio/__init__.py b/homeassistant/components/hassio/__init__.py
index cd3c704d4c9..5b5cc48eed8 100644
--- a/homeassistant/components/hassio/__init__.py
+++ b/homeassistant/components/hassio/__init__.py
@@ -504,7 +504,7 @@ def is_hassio(hass: HomeAssistant) -> bool:
 
 
 @callback
-def get_supervisor_ip() -> str:
+def get_supervisor_ip() -> str | None:
     """Return the supervisor ip address."""
     if "SUPERVISOR" not in os.environ:
         return None
@@ -537,6 +537,8 @@ async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:  # noqa:
     if (data := await store.async_load()) is None:
         data = {}
 
+    assert isinstance(data, dict)
+
     refresh_token = None
     if "hassio_user" in data:
         user = await hass.auth.async_get_user(data["hassio_user"])
@@ -710,6 +712,7 @@ async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:  # noqa:
     async_setup_discovery_view(hass, hassio)
 
     # Init auth Hass.io feature
+    assert user is not None
     async_setup_auth_view(hass, user)
 
     # Init ingress Hass.io feature
@@ -877,7 +880,7 @@ class HassioDataUpdateCoordinator(DataUpdateCoordinator):
         except HassioAPIError as err:
             raise UpdateFailed(f"Error on Supervisor API: {err}") from err
 
-        new_data = {}
+        new_data: dict[str, Any] = {}
         supervisor_info = get_supervisor_info(self.hass)
         addons_info = get_addons_info(self.hass)
         addons_stats = get_addons_stats(self.hass)
diff --git a/homeassistant/components/hassio/auth.py b/homeassistant/components/hassio/auth.py
index f52a8ef0617..37687ee70df 100644
--- a/homeassistant/components/hassio/auth.py
+++ b/homeassistant/components/hassio/auth.py
@@ -43,6 +43,7 @@ class HassIOBaseAuth(HomeAssistantView):
         """Check if this call is from Supervisor."""
         # Check caller IP
         hassio_ip = os.environ["SUPERVISOR"].split(":")[0]
+        assert request.transport
         if ip_address(request.transport.get_extra_info("peername")[0]) != ip_address(
             hassio_ip
         ):
diff --git a/homeassistant/components/hassio/binary_sensor.py b/homeassistant/components/hassio/binary_sensor.py
index c2bcd5eaf68..85cb402b0ca 100644
--- a/homeassistant/components/hassio/binary_sensor.py
+++ b/homeassistant/components/hassio/binary_sensor.py
@@ -59,7 +59,7 @@ async def async_setup_entry(
     """Binary sensor set up for Hass.io config entry."""
     coordinator = hass.data[ADDONS_COORDINATOR]
 
-    entities = []
+    entities: list[HassioAddonBinarySensor | HassioOSBinarySensor] = []
 
     for entity_description in ADDON_ENTITY_DESCRIPTIONS:
         for addon in coordinator.data[DATA_KEY_ADDONS].values():
diff --git a/homeassistant/components/hassio/ingress.py b/homeassistant/components/hassio/ingress.py
index 6caa97b788f..8aacbac99f6 100644
--- a/homeassistant/components/hassio/ingress.py
+++ b/homeassistant/components/hassio/ingress.py
@@ -2,6 +2,7 @@
 from __future__ import annotations
 
 import asyncio
+from collections.abc import Iterable
 from ipaddress import ip_address
 import logging
 import os
@@ -73,6 +74,7 @@ class HassIOIngress(HomeAssistantView):
         self, request: web.Request, token: str, path: str
     ) -> web.WebSocketResponse:
         """Ingress route for websocket."""
+        req_protocols: Iterable[str]
         if hdrs.SEC_WEBSOCKET_PROTOCOL in request.headers:
             req_protocols = [
                 str(proto.strip())
@@ -190,6 +192,7 @@ def _init_header(request: web.Request, token: str) -> CIMultiDict | dict[str, st
 
     # Set X-Forwarded-For
     forward_for = request.headers.get(hdrs.X_FORWARDED_FOR)
+    assert request.transport
     if (peername := request.transport.get_extra_info("peername")) is None:
         _LOGGER.error("Can't set forward_for header, missing peername")
         raise HTTPBadRequest()
diff --git a/homeassistant/components/hassio/sensor.py b/homeassistant/components/hassio/sensor.py
index 42be1ff4b0a..55fcb0bcd28 100644
--- a/homeassistant/components/hassio/sensor.py
+++ b/homeassistant/components/hassio/sensor.py
@@ -65,7 +65,7 @@ async def async_setup_entry(
     """Sensor set up for Hass.io config entry."""
     coordinator = hass.data[ADDONS_COORDINATOR]
 
-    entities = []
+    entities: list[HassioOSSensor | HassioAddonSensor] = []
 
     for addon in coordinator.data[DATA_KEY_ADDONS].values():
         for entity_description in ADDON_ENTITY_DESCRIPTIONS:
diff --git a/homeassistant/components/hassio/system_health.py b/homeassistant/components/hassio/system_health.py
index b1fc208de80..d8d29f44d68 100644
--- a/homeassistant/components/hassio/system_health.py
+++ b/homeassistant/components/hassio/system_health.py
@@ -1,4 +1,6 @@
 """Provide info to system health."""
+from __future__ import annotations
+
 import os
 
 from homeassistant.components import system_health
@@ -24,6 +26,7 @@ async def system_health_info(hass: HomeAssistant):
     host_info = get_host_info(hass)
     supervisor_info = get_supervisor_info(hass)
 
+    healthy: bool | dict[str, str]
     if supervisor_info.get("healthy"):
         healthy = True
     else:
@@ -32,6 +35,7 @@ async def system_health_info(hass: HomeAssistant):
             "error": "Unhealthy",
         }
 
+    supported: bool | dict[str, str]
     if supervisor_info.get("supported"):
         supported = True
     else:
diff --git a/homeassistant/components/hassio/websocket_api.py b/homeassistant/components/hassio/websocket_api.py
index 7eb037d8432..b25d9fda7a0 100644
--- a/homeassistant/components/hassio/websocket_api.py
+++ b/homeassistant/components/hassio/websocket_api.py
@@ -1,5 +1,6 @@
 """Websocekt API handlers for the hassio integration."""
 import logging
+from numbers import Number
 import re
 
 import voluptuous as vol
@@ -56,8 +57,8 @@ def async_load_websocket_api(hass: HomeAssistant):
 
 
 @websocket_api.require_admin
-@websocket_api.async_response
 @websocket_api.websocket_command({vol.Required(WS_TYPE): WS_TYPE_SUBSCRIBE})
+@websocket_api.async_response
 async def websocket_subscribe(
     hass: HomeAssistant, connection: ActiveConnection, msg: dict
 ):
@@ -74,13 +75,13 @@ async def websocket_subscribe(
     connection.send_message(websocket_api.result_message(msg[WS_ID]))
 
 
-@websocket_api.async_response
 @websocket_api.websocket_command(
     {
         vol.Required(WS_TYPE): WS_TYPE_EVENT,
         vol.Required(ATTR_DATA): SCHEMA_WEBSOCKET_EVENT,
     }
 )
+@websocket_api.async_response
 async def websocket_supervisor_event(
     hass: HomeAssistant, connection: ActiveConnection, msg: dict
 ):
@@ -89,16 +90,16 @@ async def websocket_supervisor_event(
     connection.send_result(msg[WS_ID])
 
 
-@websocket_api.async_response
 @websocket_api.websocket_command(
     {
         vol.Required(WS_TYPE): WS_TYPE_API,
         vol.Required(ATTR_ENDPOINT): cv.string,
         vol.Required(ATTR_METHOD): cv.string,
         vol.Optional(ATTR_DATA): dict,
-        vol.Optional(ATTR_TIMEOUT): vol.Any(cv.Number, None),
+        vol.Optional(ATTR_TIMEOUT): vol.Any(Number, None),
     }
 )
+@websocket_api.async_response
 async def websocket_supervisor_api(
     hass: HomeAssistant, connection: ActiveConnection, msg: dict
 ):
diff --git a/mypy.ini b/mypy.ini
index c4a135322fe..fc99119cda3 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -2653,27 +2653,6 @@ ignore_errors = true
 [mypy-homeassistant.components.evohome.water_heater]
 ignore_errors = true
 
-[mypy-homeassistant.components.hassio]
-ignore_errors = true
-
-[mypy-homeassistant.components.hassio.auth]
-ignore_errors = true
-
-[mypy-homeassistant.components.hassio.binary_sensor]
-ignore_errors = true
-
-[mypy-homeassistant.components.hassio.ingress]
-ignore_errors = true
-
-[mypy-homeassistant.components.hassio.sensor]
-ignore_errors = true
-
-[mypy-homeassistant.components.hassio.system_health]
-ignore_errors = true
-
-[mypy-homeassistant.components.hassio.websocket_api]
-ignore_errors = true
-
 [mypy-homeassistant.components.icloud]
 ignore_errors = true
 
diff --git a/script/hassfest/mypy_config.py b/script/hassfest/mypy_config.py
index e7c5e0ed129..7f1faf00bb6 100644
--- a/script/hassfest/mypy_config.py
+++ b/script/hassfest/mypy_config.py
@@ -26,13 +26,6 @@ IGNORED_MODULES: Final[list[str]] = [
     "homeassistant.components.evohome",
     "homeassistant.components.evohome.climate",
     "homeassistant.components.evohome.water_heater",
-    "homeassistant.components.hassio",
-    "homeassistant.components.hassio.auth",
-    "homeassistant.components.hassio.binary_sensor",
-    "homeassistant.components.hassio.ingress",
-    "homeassistant.components.hassio.sensor",
-    "homeassistant.components.hassio.system_health",
-    "homeassistant.components.hassio.websocket_api",
     "homeassistant.components.icloud",
     "homeassistant.components.icloud.account",
     "homeassistant.components.icloud.device_tracker",