diff --git a/compiler/docs/compiler.py b/compiler/docs/compiler.py
index fdb4972d..479ee2b8 100644
--- a/compiler/docs/compiler.py
+++ b/compiler/docs/compiler.py
@@ -197,6 +197,7 @@ def pyrogram_api():
             set_chat_permissions
             pin_chat_message
             unpin_chat_message
+            unpin_all_chat_messages
             get_chat
             get_chat_member
             get_chat_members
diff --git a/pyrogram/methods/chats/__init__.py b/pyrogram/methods/chats/__init__.py
index b55d1be7..8bd785c3 100644
--- a/pyrogram/methods/chats/__init__.py
+++ b/pyrogram/methods/chats/__init__.py
@@ -49,6 +49,7 @@ from .set_chat_title import SetChatTitle
 from .set_slow_mode import SetSlowMode
 from .unarchive_chats import UnarchiveChats
 from .unban_chat_member import UnbanChatMember
+from .unpin_all_chat_messages import UnpinAllChatMessages
 from .unpin_chat_message import UnpinChatMessage
 from .update_chat_username import UpdateChatUsername
 
@@ -88,6 +89,7 @@ class Chats(
     GetNearbyChats,
     SetAdministratorTitle,
     SetSlowMode,
-    DeleteUserHistory
+    DeleteUserHistory,
+    UnpinAllChatMessages
 ):
     pass
diff --git a/pyrogram/methods/chats/unpin_all_chat_messages.py b/pyrogram/methods/chats/unpin_all_chat_messages.py
new file mode 100644
index 00000000..a6f325a4
--- /dev/null
+++ b/pyrogram/methods/chats/unpin_all_chat_messages.py
@@ -0,0 +1,53 @@
+#  Pyrogram - Telegram MTProto API Client Library for Python
+#  Copyright (C) 2017-2020 Dan <https://github.com/delivrance>
+#
+#  This file is part of Pyrogram.
+#
+#  Pyrogram is free software: you can redistribute it and/or modify
+#  it under the terms of the GNU Lesser General Public License as published
+#  by the Free Software Foundation, either version 3 of the License, or
+#  (at your option) any later version.
+#
+#  Pyrogram is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU Lesser General Public License for more details.
+#
+#  You should have received a copy of the GNU Lesser General Public License
+#  along with Pyrogram.  If not, see <http://www.gnu.org/licenses/>.
+
+from typing import Union
+
+from pyrogram import raw
+from pyrogram.scaffold import Scaffold
+
+
+class UnpinAllChatMessages(Scaffold):
+    async def unpin_all_chat_messages(
+        self,
+        chat_id: Union[int, str],
+    ) -> bool:
+        """Use this method to clear the list of pinned messages in a chat.
+        If the chat is not a private chat, the bot must be an administrator in the chat for this to work and must have
+        the 'can_pin_messages' admin right in a supergroup or 'can_edit_messages' admin right in a channel.
+
+        Parameters:
+            chat_id (``int`` | ``str``):
+                Unique identifier (int) or username (str) of the target chat.
+
+        Returns:
+            ``bool``: True on success.
+
+        Example:
+            .. code-block:: python
+
+                # Unpin all chat messages
+                app.unpin_all_chat_messages(chat_id)
+        """
+        await self.send(
+            raw.functions.messages.UnpinAllMessages(
+                peer=await self.resolve_peer(chat_id)
+            )
+        )
+
+        return True
diff --git a/pyrogram/methods/chats/unpin_chat_message.py b/pyrogram/methods/chats/unpin_chat_message.py
index 52e533ed..79a4a4c2 100644
--- a/pyrogram/methods/chats/unpin_chat_message.py
+++ b/pyrogram/methods/chats/unpin_chat_message.py
@@ -26,7 +26,7 @@ class UnpinChatMessage(Scaffold):
     async def unpin_chat_message(
         self,
         chat_id: Union[int, str],
-        message_id: int
+        message_id: int = 0
     ) -> bool:
         """Unpin a message in a group, channel or your own chat.
         You must be an administrator in the chat for this to work and must have the "can_pin_messages" admin
@@ -36,8 +36,9 @@ class UnpinChatMessage(Scaffold):
             chat_id (``int`` | ``str``):
                 Unique identifier (int) or username (str) of the target chat.
 
-            message_id (``int``):
+            message_id (``int``, *optional*):
                 Identifier of a message to unpin.
+                If not specified, the most recent pinned message (by sending date) will be unpinned.
 
         Returns:
             ``bool``: True on success.