diff --git a/homeassistant/components/mill/climate.py b/homeassistant/components/mill/climate.py
index fbe4ad44710..a18f9b3bafb 100644
--- a/homeassistant/components/mill/climate.py
+++ b/homeassistant/components/mill/climate.py
@@ -92,7 +92,6 @@ class MillHeater(CoordinatorEntity, ClimateEntity):
     _attr_fan_modes = [FAN_ON, FAN_OFF]
     _attr_max_temp = MAX_TEMP
     _attr_min_temp = MIN_TEMP
-    _attr_target_temperature_step = PRECISION_WHOLE
     _attr_temperature_unit = TEMP_CELSIUS
 
     def __init__(self, coordinator, heater):
@@ -120,8 +119,10 @@ class MillHeater(CoordinatorEntity, ClimateEntity):
             self._attr_supported_features = (
                 ClimateEntityFeature.TARGET_TEMPERATURE | ClimateEntityFeature.FAN_MODE
             )
+            self._attr_target_temperature_step = PRECISION_WHOLE
         else:
             self._attr_supported_features = ClimateEntityFeature.TARGET_TEMPERATURE
+            self._attr_target_temperature_step = PRECISION_HALVES
 
         self._update_attr(heater)
 
@@ -130,7 +131,7 @@ class MillHeater(CoordinatorEntity, ClimateEntity):
         if (temperature := kwargs.get(ATTR_TEMPERATURE)) is None:
             return
         await self.coordinator.mill_data_connection.set_heater_temp(
-            self._id, int(temperature)
+            self._id, float(temperature)
         )
         await self.coordinator.async_request_refresh()
 
diff --git a/homeassistant/components/mill/manifest.json b/homeassistant/components/mill/manifest.json
index c2adebae594..9a1026e4dfd 100644
--- a/homeassistant/components/mill/manifest.json
+++ b/homeassistant/components/mill/manifest.json
@@ -2,7 +2,7 @@
   "domain": "mill",
   "name": "Mill",
   "documentation": "https://www.home-assistant.io/integrations/mill",
-  "requirements": ["millheater==0.9.0", "mill-local==0.1.1"],
+  "requirements": ["millheater==0.10.0", "mill-local==0.1.1"],
   "codeowners": ["@danielhiversen"],
   "config_flow": true,
   "iot_class": "local_polling",
diff --git a/requirements_all.txt b/requirements_all.txt
index ce54414af84..3556fc845af 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -1061,7 +1061,7 @@ micloud==0.5
 mill-local==0.1.1
 
 # homeassistant.components.mill
-millheater==0.9.0
+millheater==0.10.0
 
 # homeassistant.components.minio
 minio==5.0.10
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index 67949a21a2d..678316b2a6c 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -760,7 +760,7 @@ micloud==0.5
 mill-local==0.1.1
 
 # homeassistant.components.mill
-millheater==0.9.0
+millheater==0.10.0
 
 # homeassistant.components.minio
 minio==5.0.10