diff --git a/homeassistant/components/homekit/accessories.py b/homeassistant/components/homekit/accessories.py
index 3cd3c46613b..cb1c76656bb 100644
--- a/homeassistant/components/homekit/accessories.py
+++ b/homeassistant/components/homekit/accessories.py
@@ -25,6 +25,7 @@ from homeassistant.const import (
     DEVICE_CLASS_ILLUMINANCE,
     DEVICE_CLASS_TEMPERATURE,
     STATE_ON,
+    STATE_UNAVAILABLE,
     TEMP_CELSIUS,
     TEMP_FAHRENHEIT,
     UNIT_PERCENTAGE,
@@ -322,6 +323,12 @@ class HomeAccessory(Accessory):
             CHAR_STATUS_LOW_BATTERY, value=0
         )
 
+    @property
+    def available(self):
+        """Return if accessory is available."""
+        state = self.hass.states.get(self.entity_id)
+        return state is not None and state.state != STATE_UNAVAILABLE
+
     async def run(self):
         """Handle accessory driver started event.
 
diff --git a/homeassistant/components/homekit/manifest.json b/homeassistant/components/homekit/manifest.json
index 8f7382b5d85..985fcc1e799 100644
--- a/homeassistant/components/homekit/manifest.json
+++ b/homeassistant/components/homekit/manifest.json
@@ -2,7 +2,7 @@
   "domain": "homekit",
   "name": "HomeKit",
   "documentation": "https://www.home-assistant.io/integrations/homekit",
-  "requirements": ["HAP-python==2.8.4","fnvhash==0.1.0","PyQRCode==1.2.1","base36==0.1.1","PyTurboJPEG==1.4.0"],
+  "requirements": ["HAP-python==2.9.1","fnvhash==0.1.0","PyQRCode==1.2.1","base36==0.1.1","PyTurboJPEG==1.4.0"],
   "dependencies": ["http", "camera", "ffmpeg"],
   "after_dependencies": ["logbook", "zeroconf"],
   "codeowners": ["@bdraco"],
diff --git a/requirements_all.txt b/requirements_all.txt
index a8aff04a190..90a2a87df1f 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -35,7 +35,7 @@ Adafruit-SHT31==1.0.2
 # Adafruit_BBIO==1.1.1
 
 # homeassistant.components.homekit
-HAP-python==2.8.4
+HAP-python==2.9.1
 
 # homeassistant.components.mastodon
 Mastodon.py==1.5.1
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index 79516cf84bc..c30e6745cbc 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -4,7 +4,7 @@
 -r requirements_test.txt
 
 # homeassistant.components.homekit
-HAP-python==2.8.4
+HAP-python==2.9.1
 
 # homeassistant.components.plugwise
 Plugwise_Smile==0.2.10
diff --git a/tests/components/homekit/test_accessories.py b/tests/components/homekit/test_accessories.py
index 092c68a5480..abc6d9b5528 100644
--- a/tests/components/homekit/test_accessories.py
+++ b/tests/components/homekit/test_accessories.py
@@ -42,6 +42,7 @@ from homeassistant.const import (
     EVENT_TIME_CHANGED,
     STATE_OFF,
     STATE_ON,
+    STATE_UNAVAILABLE,
     __version__,
 )
 import homeassistant.util.dt as dt_util
@@ -88,7 +89,7 @@ async def test_home_accessory(hass, hk_driver):
     entity_id2 = "light.accessory"
 
     hass.states.async_set(entity_id, None)
-    hass.states.async_set(entity_id2, None)
+    hass.states.async_set(entity_id2, STATE_UNAVAILABLE)
 
     await hass.async_block_till_done()
 
@@ -98,6 +99,7 @@ async def test_home_accessory(hass, hk_driver):
     assert acc.hass == hass
     assert acc.display_name == "Home Accessory"
     assert acc.aid == 2
+    assert acc.available is True
     assert acc.category == 1  # Category.OTHER
     assert len(acc.services) == 1
     serv = acc.services[0]  # SERV_ACCESSORY_INFO
@@ -127,6 +129,7 @@ async def test_home_accessory(hass, hk_driver):
             ATTR_INTERGRATION: "luxe",
         },
     )
+    assert acc3.available is False
     serv = acc3.services[0]  # SERV_ACCESSORY_INFO
     assert serv.get_characteristic(CHAR_NAME).value == "Home Accessory"
     assert serv.get_characteristic(CHAR_MANUFACTURER).value == "Lux Brands"