diff --git a/homeassistant/components/plaato/__init__.py b/homeassistant/components/plaato/__init__.py
index 89da2114849..183eb98e213 100644
--- a/homeassistant/components/plaato/__init__.py
+++ b/homeassistant/components/plaato/__init__.py
@@ -33,6 +33,7 @@ from homeassistant.const import (
     TEMP_FAHRENHEIT,
     VOLUME_GALLONS,
     VOLUME_LITERS,
+    Platform,
 )
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers import aiohttp_client
@@ -219,7 +220,7 @@ class PlaatoCoordinator(DataUpdateCoordinator):
         self.api = Plaato(auth_token=auth_token)
         self.hass = hass
         self.device_type = device_type
-        self.platforms = []
+        self.platforms: list[Platform] = []
 
         super().__init__(
             hass,
diff --git a/homeassistant/components/plaato/binary_sensor.py b/homeassistant/components/plaato/binary_sensor.py
index 94e4a57103f..a8b7dc51c1e 100644
--- a/homeassistant/components/plaato/binary_sensor.py
+++ b/homeassistant/components/plaato/binary_sensor.py
@@ -55,3 +55,4 @@ class PlaatoBinarySensor(PlaatoEntity, BinarySensorEntity):
             return BinarySensorDeviceClass.PROBLEM
         if self._sensor_type is PlaatoKeg.Pins.POURING:
             return BinarySensorDeviceClass.OPENING
+        return None
diff --git a/mypy.ini b/mypy.ini
index 06b3e30e6b7..581ff48e6ba 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -2155,9 +2155,6 @@ ignore_errors = true
 [mypy-homeassistant.components.philips_js.*]
 ignore_errors = true
 
-[mypy-homeassistant.components.plaato.*]
-ignore_errors = true
-
 [mypy-homeassistant.components.plex.*]
 ignore_errors = true
 
diff --git a/script/hassfest/mypy_config.py b/script/hassfest/mypy_config.py
index 85d62447685..cc11d0f97e5 100644
--- a/script/hassfest/mypy_config.py
+++ b/script/hassfest/mypy_config.py
@@ -60,7 +60,6 @@ IGNORED_MODULES: Final[list[str]] = [
     "homeassistant.components.onvif.*",
     "homeassistant.components.ozw.*",
     "homeassistant.components.philips_js.*",
-    "homeassistant.components.plaato.*",
     "homeassistant.components.plex.*",
     "homeassistant.components.plugwise.*",
     "homeassistant.components.profiler.*",