diff --git a/homeassistant/components/sensibo/climate.py b/homeassistant/components/sensibo/climate.py
index 906c4259ce5..a40cb110f66 100644
--- a/homeassistant/components/sensibo/climate.py
+++ b/homeassistant/components/sensibo/climate.py
@@ -252,7 +252,7 @@ class SensiboClimate(SensiboDeviceBaseEntity, ClimateEntity):
         return features
 
     @property
-    def current_humidity(self) -> int | None:
+    def current_humidity(self) -> float | None:
         """Return the current humidity."""
         return self.device_data.humidity
 
diff --git a/homeassistant/components/sensibo/manifest.json b/homeassistant/components/sensibo/manifest.json
index 610695aaf7b..4cadd3f8692 100644
--- a/homeassistant/components/sensibo/manifest.json
+++ b/homeassistant/components/sensibo/manifest.json
@@ -15,5 +15,5 @@
   "iot_class": "cloud_polling",
   "loggers": ["pysensibo"],
   "quality_scale": "platinum",
-  "requirements": ["pysensibo==1.1.0"]
+  "requirements": ["pysensibo==1.2.1"]
 }
diff --git a/homeassistant/components/sensibo/sensor.py b/homeassistant/components/sensibo/sensor.py
index 09f095bfaec..bab85eb2294 100644
--- a/homeassistant/components/sensibo/sensor.py
+++ b/homeassistant/components/sensibo/sensor.py
@@ -101,14 +101,25 @@ MOTION_SENSOR_TYPES: tuple[SensiboMotionSensorEntityDescription, ...] = (
         value_fn=lambda data: data.temperature,
     ),
 )
+
+
+def _pure_aqi(pm25_pure: PureAQI | None) -> str | None:
+    """Return the Pure aqi name or None if unknown."""
+    if pm25_pure:
+        aqi_name = pm25_pure.name.lower()
+        if aqi_name != "unknown":
+            return aqi_name
+    return None
+
+
 PURE_SENSOR_TYPES: tuple[SensiboDeviceSensorEntityDescription, ...] = (
     SensiboDeviceSensorEntityDescription(
         key="pm25",
         translation_key="pm25_pure",
         device_class=SensorDeviceClass.ENUM,
-        value_fn=lambda data: data.pm25_pure.name.lower() if data.pm25_pure else None,
+        value_fn=lambda data: _pure_aqi(data.pm25_pure),
         extra_fn=None,
-        options=[aqi.name.lower() for aqi in PureAQI],
+        options=[aqi.name.lower() for aqi in PureAQI if aqi.name != "UNKNOWN"],
     ),
     SensiboDeviceSensorEntityDescription(
         key="pure_sensitivity",
@@ -119,6 +130,7 @@ PURE_SENSOR_TYPES: tuple[SensiboDeviceSensorEntityDescription, ...] = (
     FILTER_LAST_RESET_DESCRIPTION,
 )
 
+
 DEVICE_SENSOR_TYPES: tuple[SensiboDeviceSensorEntityDescription, ...] = (
     SensiboDeviceSensorEntityDescription(
         key="timer_time",
diff --git a/requirements_all.txt b/requirements_all.txt
index 9a5807d7b40..42c54364162 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -2293,7 +2293,7 @@ pysaj==0.0.16
 pyschlage==2025.4.0
 
 # homeassistant.components.sensibo
-pysensibo==1.1.0
+pysensibo==1.2.1
 
 # homeassistant.components.serial
 pyserial-asyncio-fast==0.16
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index 7491190cb92..aba6bd90c02 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -1875,7 +1875,7 @@ pysabnzbd==1.1.1
 pyschlage==2025.4.0
 
 # homeassistant.components.sensibo
-pysensibo==1.1.0
+pysensibo==1.2.1
 
 # homeassistant.components.acer_projector
 # homeassistant.components.crownstone
diff --git a/tests/components/sensibo/test_sensor.py b/tests/components/sensibo/test_sensor.py
index 8ea76036123..7b7450b97a4 100644
--- a/tests/components/sensibo/test_sensor.py
+++ b/tests/components/sensibo/test_sensor.py
@@ -11,7 +11,7 @@ import pytest
 from syrupy.assertion import SnapshotAssertion
 
 from homeassistant.config_entries import ConfigEntry
-from homeassistant.const import Platform
+from homeassistant.const import STATE_UNKNOWN, Platform
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers import entity_registry as er
 
@@ -45,3 +45,14 @@ async def test_sensor(
 
     state = hass.states.get("sensor.kitchen_pure_aqi")
     assert state.state == "moderate"
+
+    mock_client.async_get_devices_data.return_value.parsed[
+        "AAZZAAZZ"
+    ].pm25_pure = PureAQI(0)
+
+    freezer.tick(timedelta(minutes=5))
+    async_fire_time_changed(hass)
+    await hass.async_block_till_done()
+
+    state = hass.states.get("sensor.kitchen_pure_aqi")
+    assert state.state == STATE_UNKNOWN