diff --git a/homeassistant/components/here_travel_time/const.py b/homeassistant/components/here_travel_time/const.py
index 300bbf617cf..a2a14a445d7 100644
--- a/homeassistant/components/here_travel_time/const.py
+++ b/homeassistant/components/here_travel_time/const.py
@@ -1,4 +1,6 @@
 """Constants for the HERE Travel Time integration."""
+from typing import Final
+
 DOMAIN = "here_travel_time"
 DEFAULT_SCAN_INTERVAL = 300
 
@@ -51,11 +53,11 @@ ICONS = {
     TRAVEL_MODE_TRUCK: ICON_TRUCK,
 }
 
-ATTR_DURATION = "duration"
-ATTR_DISTANCE = "distance"
-ATTR_ORIGIN = "origin"
-ATTR_DESTINATION = "destination"
+ATTR_DURATION: Final = "duration"
+ATTR_DISTANCE: Final = "distance"
+ATTR_ORIGIN: Final = "origin"
+ATTR_DESTINATION: Final = "destination"
 
-ATTR_DURATION_IN_TRAFFIC = "duration_in_traffic"
-ATTR_ORIGIN_NAME = "origin_name"
-ATTR_DESTINATION_NAME = "destination_name"
+ATTR_DURATION_IN_TRAFFIC: Final = "duration_in_traffic"
+ATTR_ORIGIN_NAME: Final = "origin_name"
+ATTR_DESTINATION_NAME: Final = "destination_name"
diff --git a/homeassistant/components/here_travel_time/coordinator.py b/homeassistant/components/here_travel_time/coordinator.py
index 56430d79a22..e8eee4054ec 100644
--- a/homeassistant/components/here_travel_time/coordinator.py
+++ b/homeassistant/components/here_travel_time/coordinator.py
@@ -3,7 +3,7 @@ from __future__ import annotations
 
 from datetime import datetime, time, timedelta
 import logging
-from typing import Any
+from typing import Any, Optional
 
 import here_routing
 from here_routing import (
@@ -40,7 +40,7 @@ BACKOFF_MULTIPLIER = 1.1
 _LOGGER = logging.getLogger(__name__)
 
 
-class HERERoutingDataUpdateCoordinator(DataUpdateCoordinator):
+class HERERoutingDataUpdateCoordinator(DataUpdateCoordinator[HERETravelTimeData]):
     """here_routing DataUpdateCoordinator."""
 
     def __init__(
@@ -59,7 +59,7 @@ class HERERoutingDataUpdateCoordinator(DataUpdateCoordinator):
         self._api = HERERoutingApi(api_key)
         self.config = config
 
-    async def _async_update_data(self) -> HERETravelTimeData | None:
+    async def _async_update_data(self) -> HERETravelTimeData:
         """Get the latest data from the HERE Routing API."""
         origin, destination, arrival, departure = prepare_parameters(
             self.hass, self.config
@@ -144,7 +144,9 @@ class HERERoutingDataUpdateCoordinator(DataUpdateCoordinator):
         )
 
 
-class HERETransitDataUpdateCoordinator(DataUpdateCoordinator):
+class HERETransitDataUpdateCoordinator(
+    DataUpdateCoordinator[Optional[HERETravelTimeData]]
+):
     """HERETravelTime DataUpdateCoordinator."""
 
     def __init__(
diff --git a/homeassistant/components/here_travel_time/sensor.py b/homeassistant/components/here_travel_time/sensor.py
index 445efb92dcf..ced0e9bea39 100644
--- a/homeassistant/components/here_travel_time/sensor.py
+++ b/homeassistant/components/here_travel_time/sensor.py
@@ -3,7 +3,7 @@ from __future__ import annotations
 
 from collections.abc import Mapping
 from datetime import timedelta
-from typing import Any
+from typing import Any, Union
 
 from homeassistant.components.sensor import (
     RestoreSensor,
@@ -102,7 +102,12 @@ async def async_setup_entry(
     async_add_entities(sensors)
 
 
-class HERETravelTimeSensor(CoordinatorEntity, RestoreSensor):
+class HERETravelTimeSensor(
+    CoordinatorEntity[
+        Union[HERERoutingDataUpdateCoordinator, HERETransitDataUpdateCoordinator]
+    ],
+    RestoreSensor,
+):
     """Representation of a HERE travel time sensor."""
 
     def __init__(
@@ -144,7 +149,7 @@ class HERETravelTimeSensor(CoordinatorEntity, RestoreSensor):
     def _handle_coordinator_update(self) -> None:
         """Handle updated data from the coordinator."""
         if self.coordinator.data is not None:
-            self._attr_native_value = self.coordinator.data.get(
+            self._attr_native_value = self.coordinator.data.get(  # type: ignore[assignment]
                 self.entity_description.key
             )
             self.async_write_ha_state()