diff --git a/aiolyric/objects/device.py b/aiolyric/objects/device.py
index 113c73e..67bd10c 100644
--- a/aiolyric/objects/device.py
+++ b/aiolyric/objects/device.py
@@ -259,6 +259,11 @@ def device_id(self):
         """Return the device ID."""
         return self.attributes.get("deviceID", None)
 
+    @property
+    def device_os_version(self):
+        """Return the device OS/firmware version."""
+        return self.attributes.get("deviceOsVersion", None)
+
     @property
     def name(self):
         """Return the name."""
diff --git a/tests/__init__.py b/tests/__init__.py
index ee93752..541129c 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -26,6 +26,7 @@
     "deviceClass": "Thermostat",
     "deviceType": "Thermostat",
     "deviceID": "LCC-00A01AB1ABCD",
+    "deviceOsVersion": "RCHT8610WF2006",
     "name": "Thermostat",
     "isAlive": True,
     "isUpgrading": False,
@@ -92,6 +93,7 @@
             "deviceClass": "Thermostat",
             "deviceType": "Thermostat",
             "deviceID": "LCC-00D02DD9CADE",
+            "deviceOsVersion": "RCHT8610WF2006",
             "userDefinedDeviceName": "Thermostat",
             "name": "Thermostat",
             "isAlive": True,
diff --git a/tests/objects/test_device.py b/tests/objects/test_device.py
index 5b81664..e00cabd 100644
--- a/tests/objects/test_device.py
+++ b/tests/objects/test_device.py
@@ -67,6 +67,7 @@ def test_device(
     assert obj.device_class == device_fixture_response["deviceClass"]
     assert obj.device_type == device_fixture_response["deviceType"]
     assert obj.device_id == device_fixture_response["deviceID"]
+    assert obj.device_os_version == device_fixture_response["deviceOsVersion"]
     assert obj.name == device_fixture_response["name"]
     assert obj.is_alive == device_fixture_response["isAlive"]
     assert obj.is_upgrading == device_fixture_response["isUpgrading"]
diff --git a/tests/objects/test_location.py b/tests/objects/test_location.py
index 095cfcb..0f2f3d2 100644
--- a/tests/objects/test_location.py
+++ b/tests/objects/test_location.py
@@ -93,6 +93,10 @@ def test_location(
     assert (
         obj.devices[0].device_id == location_fixture_response["devices"][0]["deviceID"]
     )
+    assert (
+        obj.devices[0].device_os_version
+        == location_fixture_response["devices"][0]["deviceOsVersion"]
+    )
     assert obj.devices[0].name == location_fixture_response["devices"][0]["name"]
     assert obj.devices[0].is_alive == location_fixture_response["devices"][0]["isAlive"]
     assert (