diff --git a/homeassistant/components/cert_expiry/sensor.py b/homeassistant/components/cert_expiry/sensor.py
index 55b72bdefcd..ecf6ce18342 100644
--- a/homeassistant/components/cert_expiry/sensor.py
+++ b/homeassistant/components/cert_expiry/sensor.py
@@ -15,8 +15,8 @@ from homeassistant.const import (
 )
 from homeassistant.core import callback
 import homeassistant.helpers.config_validation as cv
-from homeassistant.helpers.entity import Entity
 from homeassistant.helpers.event import async_call_later
+from homeassistant.helpers.update_coordinator import CoordinatorEntity
 from homeassistant.util import dt
 
 from .const import DEFAULT_PORT, DOMAIN
@@ -65,38 +65,14 @@ async def async_setup_entry(hass, entry, async_add_entities):
     async_add_entities(sensors, True)
 
 
-class CertExpiryEntity(Entity):
+class CertExpiryEntity(CoordinatorEntity):
     """Defines a base Cert Expiry entity."""
 
-    def __init__(self, coordinator):
-        """Initialize the Cert Expiry entity."""
-        self.coordinator = coordinator
-
-    async def async_added_to_hass(self):
-        """Connect to dispatcher listening for entity data notifications."""
-        self.async_on_remove(
-            self.coordinator.async_add_listener(self.async_write_ha_state)
-        )
-
-    async def async_update(self):
-        """Update Cert Expiry entity."""
-        await self.coordinator.async_request_refresh()
-
-    @property
-    def available(self):
-        """Return True if entity is available."""
-        return self.coordinator.last_update_success
-
     @property
     def icon(self):
         """Icon to use in the frontend, if any."""
         return "mdi:certificate"
 
-    @property
-    def should_poll(self):
-        """Return the polling requirement of the entity."""
-        return False
-
     @property
     def device_state_attributes(self):
         """Return additional sensor state attributes."""