diff --git a/homeassistant/components/mill/coordinator.py b/homeassistant/components/mill/coordinator.py
index 288b341b0f9..a701acb8ddb 100644
--- a/homeassistant/components/mill/coordinator.py
+++ b/homeassistant/components/mill/coordinator.py
@@ -26,7 +26,7 @@ from .const import DOMAIN
 
 _LOGGER = logging.getLogger(__name__)
 
-TWO_YEARS = 2 * 365 * 24
+TWO_YEARS_DAYS = 2 * 365
 
 
 class MillDataUpdateCoordinator(DataUpdateCoordinator):
@@ -91,7 +91,7 @@ class MillHistoricDataUpdateCoordinator(DataUpdateCoordinator):
             if not last_stats or not last_stats.get(statistic_id):
                 hourly_data = (
                     await self.mill_data_connection.fetch_historic_energy_usage(
-                        dev_id, n_days=TWO_YEARS
+                        dev_id, n_days=TWO_YEARS_DAYS
                     )
                 )
                 hourly_data = dict(sorted(hourly_data.items(), key=lambda x: x[0]))
diff --git a/homeassistant/components/mill/manifest.json b/homeassistant/components/mill/manifest.json
index bfad9b48cb9..c5cc94ead30 100644
--- a/homeassistant/components/mill/manifest.json
+++ b/homeassistant/components/mill/manifest.json
@@ -7,5 +7,5 @@
   "documentation": "https://www.home-assistant.io/integrations/mill",
   "iot_class": "local_polling",
   "loggers": ["mill", "mill_local"],
-  "requirements": ["millheater==0.12.3", "mill-local==0.3.0"]
+  "requirements": ["millheater==0.12.5", "mill-local==0.3.0"]
 }
diff --git a/requirements_all.txt b/requirements_all.txt
index c801d6b137e..9c1a484ef2e 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -1424,7 +1424,7 @@ microBeesPy==0.3.5
 mill-local==0.3.0
 
 # homeassistant.components.mill
-millheater==0.12.3
+millheater==0.12.5
 
 # homeassistant.components.minio
 minio==7.1.12
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index a3b594404bb..7a417bb1ee8 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -1197,7 +1197,7 @@ microBeesPy==0.3.5
 mill-local==0.3.0
 
 # homeassistant.components.mill
-millheater==0.12.3
+millheater==0.12.5
 
 # homeassistant.components.minio
 minio==7.1.12