diff --git a/homeassistant/components/binary_sensor/wemo.py b/homeassistant/components/binary_sensor/wemo.py
index 07deea02f6e..7f44370510e 100644
--- a/homeassistant/components/binary_sensor/wemo.py
+++ b/homeassistant/components/binary_sensor/wemo.py
@@ -40,12 +40,14 @@ class WemoBinarySensor(BinarySensorDevice):
         wemo.SUBSCRIPTION_REGISTRY.register(self.wemo)
         wemo.SUBSCRIPTION_REGISTRY.on(self.wemo, None, self._update_callback)
 
-    def _update_callback(self, _device, _params):
-        """Called by the wemo device callback to update state."""
+    def _update_callback(self, _device, _type, _params):
+        """Called by the Wemo device callback to update state."""
         _LOGGER.info(
             'Subscription update for  %s',
             _device)
-        self.update()
+        updated = self.wemo.subscription_update(_type, _params)
+        self._update(force_update=(not updated))
+
         if not hasattr(self, 'hass'):
             return
         self.schedule_update_ha_state()
@@ -72,7 +74,11 @@ class WemoBinarySensor(BinarySensorDevice):
 
     def update(self):
         """Update WeMo state."""
+        self._update(force_update=True)
+
+    def _update(self, force_update=True):
         try:
-            self._state = self.wemo.get_state(True)
-        except AttributeError:
-            _LOGGER.warning('Could not update status for %s', self.name)
+            self._state = self.wemo.get_state(force_update)
+        except AttributeError as err:
+            _LOGGER.warning('Could not update status for %s (%s)',
+                            self.name, err)
diff --git a/homeassistant/components/wemo.py b/homeassistant/components/wemo.py
index 20c9f6eeca2..d9fa0bc7f56 100644
--- a/homeassistant/components/wemo.py
+++ b/homeassistant/components/wemo.py
@@ -14,7 +14,7 @@ from homeassistant.helpers import config_validation as cv
 
 from homeassistant.const import EVENT_HOMEASSISTANT_STOP
 
-REQUIREMENTS = ['pywemo==0.4.17']
+REQUIREMENTS = ['pywemo==0.4.18']
 
 DOMAIN = 'wemo'
 
diff --git a/requirements_all.txt b/requirements_all.txt
index 8a6f550d1f9..7ae864fd84e 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -672,7 +672,7 @@ pyvera==0.2.26
 pywebpush==0.6.1
 
 # homeassistant.components.wemo
-pywemo==0.4.17
+pywemo==0.4.18
 
 # homeassistant.components.zabbix
 pyzabbix==0.7.4