diff --git a/homeassistant/components/plex/sensor.py b/homeassistant/components/plex/sensor.py
index 21e8e1a8a58..f4d5d24049c 100644
--- a/homeassistant/components/plex/sensor.py
+++ b/homeassistant/components/plex/sensor.py
@@ -2,7 +2,10 @@
 import logging
 
 from homeassistant.core import callback
-from homeassistant.helpers.dispatcher import async_dispatcher_connect, dispatcher_send
+from homeassistant.helpers.dispatcher import (
+    async_dispatcher_connect,
+    async_dispatcher_send,
+)
 from homeassistant.helpers.entity import Entity
 from homeassistant.helpers.event import async_call_later
 
@@ -58,7 +61,7 @@ class PlexSensor(Entity):
 
         @callback
         def update_plex(_):
-            dispatcher_send(
+            async_dispatcher_send(
                 self.hass,
                 PLEX_UPDATE_PLATFORMS_SIGNAL.format(self._server.machine_identifier),
             )
diff --git a/homeassistant/components/plex/server.py b/homeassistant/components/plex/server.py
index a7b66c3a3ba..4134ad4e32b 100644
--- a/homeassistant/components/plex/server.py
+++ b/homeassistant/components/plex/server.py
@@ -12,7 +12,8 @@ import requests.exceptions
 
 from homeassistant.components.media_player import DOMAIN as MP_DOMAIN
 from homeassistant.const import CONF_TOKEN, CONF_URL, CONF_VERIFY_SSL
-from homeassistant.helpers.dispatcher import async_dispatcher_send, dispatcher_send
+from homeassistant.core import callback
+from homeassistant.helpers.dispatcher import async_dispatcher_send
 from homeassistant.helpers.event import async_call_later
 
 from .const import (
@@ -175,11 +176,12 @@ class PlexServer:
         if config_entry_update_needed:
             raise ShouldUpdateConfigEntry
 
-    def refresh_entity(self, machine_identifier, device, session):
+    @callback
+    def async_refresh_entity(self, machine_identifier, device, session):
         """Forward refresh dispatch to media_player."""
         unique_id = f"{self.machine_identifier}:{machine_identifier}"
         _LOGGER.debug("Refreshing %s", unique_id)
-        dispatcher_send(
+        async_dispatcher_send(
             self.hass,
             PLEX_UPDATE_MEDIA_PLAYER_SIGNAL.format(unique_id),
             device,
@@ -262,7 +264,7 @@ class PlexServer:
             if client_id in new_clients:
                 new_entity_configs.append(client_data)
             else:
-                self.refresh_entity(
+                self.async_refresh_entity(
                     client_id, client_data["device"], client_data.get("session")
                 )
 
@@ -272,7 +274,7 @@ class PlexServer:
             self._known_clients - self._known_idle - ignored_clients
         ).difference(available_clients)
         for client_id in idle_clients:
-            self.refresh_entity(client_id, None, None)
+            self.async_refresh_entity(client_id, None, None)
             self._known_idle.add(client_id)
 
         if new_entity_configs: