diff --git a/.strict-typing b/.strict-typing
index f81b6249fed..77f7b6f50c2 100644
--- a/.strict-typing
+++ b/.strict-typing
@@ -226,6 +226,7 @@ homeassistant.components.tplink.*
 homeassistant.components.tolo.*
 homeassistant.components.tractive.*
 homeassistant.components.tradfri.*
+homeassistant.components.trafikverket_ferry.*
 homeassistant.components.trafikverket_train.*
 homeassistant.components.trafikverket_weatherstation.*
 homeassistant.components.tts.*
diff --git a/homeassistant/components/trafikverket_ferry/sensor.py b/homeassistant/components/trafikverket_ferry/sensor.py
index bab73d72210..256341a7132 100644
--- a/homeassistant/components/trafikverket_ferry/sensor.py
+++ b/homeassistant/components/trafikverket_ferry/sensor.py
@@ -4,7 +4,7 @@ from __future__ import annotations
 from collections.abc import Callable
 from dataclasses import dataclass
 from datetime import datetime, timedelta
-from typing import Any
+from typing import Any, cast
 
 from homeassistant.components.sensor import (
     SensorDeviceClass,
@@ -55,21 +55,21 @@ SENSOR_TYPES: tuple[TrafikverketSensorEntityDescription, ...] = (
         icon="mdi:clock",
         device_class=SensorDeviceClass.TIMESTAMP,
         value_fn=lambda data: as_utc(data["departure_time"]),
-        info_fn=lambda data: data["departure_information"],
+        info_fn=lambda data: cast(list[str], data["departure_information"]),
     ),
     TrafikverketSensorEntityDescription(
         key="departure_from",
         name="Departure From",
         icon="mdi:ferry",
-        value_fn=lambda data: data["departure_from"],
-        info_fn=lambda data: data["departure_information"],
+        value_fn=lambda data: cast(str, data["departure_from"]),
+        info_fn=lambda data: cast(list[str], data["departure_information"]),
     ),
     TrafikverketSensorEntityDescription(
         key="departure_to",
         name="Departure To",
         icon="mdi:ferry",
-        value_fn=lambda data: data["departure_to"],
-        info_fn=lambda data: data["departure_information"],
+        value_fn=lambda data: cast(str, data["departure_to"]),
+        info_fn=lambda data: cast(list[str], data["departure_information"]),
     ),
     TrafikverketSensorEntityDescription(
         key="departure_modified",
@@ -77,7 +77,7 @@ SENSOR_TYPES: tuple[TrafikverketSensorEntityDescription, ...] = (
         icon="mdi:clock",
         device_class=SensorDeviceClass.TIMESTAMP,
         value_fn=lambda data: as_utc(data["departure_modified"]),
-        info_fn=lambda data: data["departure_information"],
+        info_fn=lambda data: cast(list[str], data["departure_information"]),
         entity_registry_enabled_default=False,
     ),
     TrafikverketSensorEntityDescription(
diff --git a/mypy.ini b/mypy.ini
index 11a2d83ec40..9e27addae89 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -2250,6 +2250,17 @@ no_implicit_optional = true
 warn_return_any = true
 warn_unreachable = true
 
+[mypy-homeassistant.components.trafikverket_ferry.*]
+check_untyped_defs = true
+disallow_incomplete_defs = true
+disallow_subclassing_any = true
+disallow_untyped_calls = true
+disallow_untyped_decorators = true
+disallow_untyped_defs = true
+no_implicit_optional = true
+warn_return_any = true
+warn_unreachable = true
+
 [mypy-homeassistant.components.trafikverket_train.*]
 check_untyped_defs = true
 disallow_incomplete_defs = true