diff --git a/apps/emqx_retainer/src/emqx_retainer_sup.erl b/apps/emqx_retainer/src/emqx_retainer_sup.erl
index 3dadd4d6d..02ced41ef 100644
--- a/apps/emqx_retainer/src/emqx_retainer_sup.erl
+++ b/apps/emqx_retainer/src/emqx_retainer_sup.erl
@@ -37,6 +37,7 @@ ensure_worker_pool_started() ->
         _:_ -> ignore
     end.
 
+-dialyzer({no_match, [init/1]}).
 init([Env]) ->
     Retainer = #{
         id => retainer,
diff --git a/changes/v4.4.17-en.md b/changes/v4.4.17-en.md
index 620ad6e38..16f235e3a 100644
--- a/changes/v4.4.17-en.md
+++ b/changes/v4.4.17-en.md
@@ -26,4 +26,10 @@
 - Fix that `Erlang distribution` can't use TLS [#9981](https://github.com/emqx/emqx/pull/9981).
   About `Erlang distribution`, See [here](https://www.emqx.io/docs/en/v4.4/advanced/cluster.html#distributed-erlang) for details.
 
-- Fixed MQTT bridge TLS connection could not verify wildcard certificate from peer[#10094](https://github.com/emqx/emqx/pull/10094).
+- Fixed MQTT bridge TLS connection could not verify wildcard certificate from peer [#10094](https://github.com/emqx/emqx/pull/10094).
+
+- Fixed the problem that EMQX could not timely clear the disconnected MQTT connection information due to a large number of retained messages [#10189](https://github.com/emqx/emqx/pull/10189).
+  Before this fix, the `emqx_retainer` plugin and the connection cleanup process of emqx shared the same process pool.
+  Therefore, if the process pool was blocked by a large number of retain messages, many disconnected MQTT connections would not be cleaned up in time.
+  For more details, see [#9409](https://github.com/emqx/emqx/issues/9409).
+  In this fix, we created a separate process pool for the `emqx_retainer` plugin to avoid this problem.
diff --git a/changes/v4.4.17-zh.md b/changes/v4.4.17-zh.md
index df07cd348..c21a8fd8b 100644
--- a/changes/v4.4.17-zh.md
+++ b/changes/v4.4.17-zh.md
@@ -25,4 +25,10 @@
 - 修复 `Erlang distribution` 无法使用 TLS 的问题 [#9981](https://github.com/emqx/emqx/pull/9981)。
   关于 `Erlang distribution`, 详见 [这里](https://www.emqx.io/docs/zh/v4.4/advanced/cluster.html)。
 
-- 修正了 MQTT 桥接 TLS 连接无法验证对端的带通配符的证书[#10094](https://github.com/emqx/emqx/pull/10094)。
+- 修正了 MQTT 桥接 TLS 连接无法验证对端的带通配符的证书 [#10094](https://github.com/emqx/emqx/pull/10094)。
+
+- 修复由于大量 retain 消息导致 EMQX 无法及时清除已掉线的 MQTT 连接信息的问题。[#10189](https://github.com/emqx/emqx/pull/10189)。
+  在此修复之前，`emqx_retainer` 插件和 emqx 的连接信息清理过程共用了同一个进程池，所以
+  如果该进程池被大量的 retain 消息下发任务阻塞时，许多已经掉线的 MQTT 连接将得不到及时清理。
+  问题详情见 [#9409](https://github.com/emqx/emqx/issues/9409)。
+  在此修复中，我们给 `emqx_retainer` 插件创建了单独的进程池，从而避免了该问题。