diff --git a/packages/client/src/client.ts b/packages/client/src/client.ts
index 2c6394f5..c4546f97 100644
--- a/packages/client/src/client.ts
+++ b/packages/client/src/client.ts
@@ -95,6 +95,7 @@ import { sendMedia } from './methods/messages/send-media'
 import { sendText } from './methods/messages/send-text'
 import { sendTyping } from './methods/messages/send-typing'
 import { sendVote } from './methods/messages/send-vote'
+import { unpinAllMessages } from './methods/messages/unpin-all-messages'
 import { unpinMessage } from './methods/messages/unpin-message'
 import { initTakeoutSession } from './methods/misc/init-takeout-session'
 import {
@@ -2313,6 +2314,12 @@ export interface TelegramClient extends BaseTelegramClient {
         message: number,
         options: null | MaybeArray<number | Buffer>
     ): Promise<Poll>
+    /**
+     * Unpin all pinned messages in a chat.
+     *
+     * @param chatId  Chat or user ID
+     */
+    unpinAllMessages(chatId: InputPeerLike): Promise<void>
     /**
      * Unpin a message in a group, supergroup, channel or PM.
      *
@@ -2937,6 +2944,7 @@ export class TelegramClient extends BaseTelegramClient {
     sendText = sendText
     sendTyping = sendTyping
     sendVote = sendVote
+    unpinAllMessages = unpinAllMessages
     unpinMessage = unpinMessage
     initTakeoutSession = initTakeoutSession
     registerParseMode = registerParseMode
diff --git a/packages/client/src/methods/messages/delete-messages.ts b/packages/client/src/methods/messages/delete-messages.ts
index f90b579e..b9926f89 100644
--- a/packages/client/src/methods/messages/delete-messages.ts
+++ b/packages/client/src/methods/messages/delete-messages.ts
@@ -31,7 +31,7 @@ export async function deleteMessages(
             channel,
             id: ids
         })
-        upd = createDummyUpdate(res.pts, res.ptsCount, (channel as tl.RawInputChannel).channelId)
+        upd = createDummyUpdate(res.pts, res.ptsCount, peer.channelId)
     } else {
         const res = await this.call({
             _: 'messages.deleteMessages',
diff --git a/packages/client/src/methods/messages/unpin-all-messages.ts b/packages/client/src/methods/messages/unpin-all-messages.ts
new file mode 100644
index 00000000..16066620
--- /dev/null
+++ b/packages/client/src/methods/messages/unpin-all-messages.ts
@@ -0,0 +1,28 @@
+import { TelegramClient } from '../../client'
+import { InputPeerLike } from '../../types'
+import { isInputPeerChannel, normalizeToInputPeer } from '../../utils/peer-utils'
+import { createDummyUpdate } from '../../utils/updates-utils'
+
+/**
+ * Unpin all pinned messages in a chat.
+ *
+ * @param chatId  Chat or user ID
+ * @internal
+ */
+export async function unpinAllMessages(
+    this: TelegramClient,
+    chatId: InputPeerLike
+): Promise<void> {
+    const peer = normalizeToInputPeer(await this.resolvePeer(chatId))
+
+    const res = await this.call({
+        _: 'messages.unpinAllMessages',
+        peer
+    })
+
+    if (isInputPeerChannel(peer)) {
+        this._handleUpdate(createDummyUpdate(res.pts, res.ptsCount, peer.channelId))
+    } else {
+        createDummyUpdate(res.pts, res.ptsCount)
+    }
+}