diff --git a/homeassistant/components/xiaomi_miio/entity.py b/homeassistant/components/xiaomi_miio/entity.py
index b776061f9212..2f9b7c18465a 100644
--- a/homeassistant/components/xiaomi_miio/entity.py
+++ b/homeassistant/components/xiaomi_miio/entity.py
@@ -177,6 +177,6 @@ class XiaomiGatewayDevice(CoordinatorEntity[GatewayDeviceCoordinator], Entity):
             manufacturer="Xiaomi",
             name=self._sub_device.name,
             model=self._sub_device.model,
-            sw_version=self._sub_device.firmware_version,
+            sw_version=str(self._sub_device.firmware_version),
             hw_version=self._sub_device.zigbee_model,
         )