diff --git a/homeassistant/components/steam_online/coordinator.py b/homeassistant/components/steam_online/coordinator.py
index f210c449fa6..30178fa2b82 100644
--- a/homeassistant/components/steam_online/coordinator.py
+++ b/homeassistant/components/steam_online/coordinator.py
@@ -2,6 +2,7 @@
 from __future__ import annotations
 
 from datetime import timedelta
+from typing import Union
 
 import steam
 from steam.api import _interface_method as INTMethod
@@ -15,7 +16,9 @@ from homeassistant.helpers.update_coordinator import DataUpdateCoordinator, Upda
 from .const import CONF_ACCOUNTS, DOMAIN, LOGGER
 
 
-class SteamDataUpdateCoordinator(DataUpdateCoordinator):
+class SteamDataUpdateCoordinator(
+    DataUpdateCoordinator[dict[str, dict[str, Union[str, int]]]]
+):
     """Data update coordinator for the Steam integration."""
 
     config_entry: ConfigEntry
diff --git a/homeassistant/components/steam_online/sensor.py b/homeassistant/components/steam_online/sensor.py
index 307dfac0542..70225a90a1c 100644
--- a/homeassistant/components/steam_online/sensor.py
+++ b/homeassistant/components/steam_online/sensor.py
@@ -3,6 +3,7 @@ from __future__ import annotations
 
 from datetime import datetime
 from time import localtime, mktime
+from typing import Optional, cast
 
 from homeassistant.components.sensor import SensorEntity, SensorEntityDescription
 from homeassistant.config_entries import ConfigEntry
@@ -56,17 +57,17 @@ class SteamSensor(SteamEntity, SensorEntity):
         """Return the state of the sensor."""
         if self.entity_description.key in self.coordinator.data:
             player = self.coordinator.data[self.entity_description.key]
-            return STEAM_STATUSES[player["personastate"]]
+            return STEAM_STATUSES[cast(int, player["personastate"])]
         return None
 
     @property
-    def extra_state_attributes(self) -> dict[str, str | datetime]:
+    def extra_state_attributes(self) -> dict[str, str | int | datetime]:
         """Return the state attributes of the sensor."""
         if self.entity_description.key not in self.coordinator.data:
             return {}
         player = self.coordinator.data[self.entity_description.key]
 
-        attrs: dict[str, str | datetime] = {}
+        attrs: dict[str, str | int | datetime] = {}
         if game := player.get("gameextrainfo"):
             attrs["game"] = game
         if game_id := player.get("gameid"):
@@ -76,9 +77,9 @@ class SteamSensor(SteamEntity, SensorEntity):
             attrs["game_image_main"] = f"{game_url}{STEAM_MAIN_IMAGE_FILE}"
             if info := self._get_game_icon(player):
                 attrs["game_icon"] = f"{STEAM_ICON_URL}{game_id}/{info}.jpg"
-        self._attr_name = player["personaname"]
-        self._attr_entity_picture = player["avatarmedium"]
-        if last_online := player.get("lastlogoff"):
+        self._attr_name = str(player["personaname"]) or None
+        self._attr_entity_picture = str(player["avatarmedium"]) or None
+        if last_online := cast(Optional[int], player.get("lastlogoff")):
             attrs["last_online"] = utc_from_timestamp(mktime(localtime(last_online)))
         if level := self.coordinator.data[self.entity_description.key]["level"]:
             attrs["level"] = level