diff --git a/telegram-bot-api/Client.cpp b/telegram-bot-api/Client.cpp
index db4f63d..192ae0b 100644
--- a/telegram-bot-api/Client.cpp
+++ b/telegram-bot-api/Client.cpp
@@ -259,6 +259,7 @@ bool Client::init_methods() {
   methods_.emplace("closeforumtopic", &Client::process_close_forum_topic_query);
   methods_.emplace("reopenforumtopic", &Client::process_reopen_forum_topic_query);
   methods_.emplace("deleteforumtopic", &Client::process_delete_forum_topic_query);
+  methods_.emplace("unpinallforumtopicmessages", &Client::process_unpin_all_forum_topic_messages_query);
   methods_.emplace("getchatmember", &Client::process_get_chat_member_query);
   methods_.emplace("getchatadministrators", &Client::process_get_chat_administrators_query);
   methods_.emplace("getchatmembercount", &Client::process_get_chat_member_count_query);
@@ -8219,6 +8220,18 @@ td::Status Client::process_delete_forum_topic_query(PromisedQueryPtr &query) {
   return Status::OK();
 }
 
+td::Status Client::process_unpin_all_forum_topic_messages_query(PromisedQueryPtr &query) {
+  auto chat_id = query->arg("chat_id");
+  auto message_thread_id = get_message_id(query.get(), "message_thread_id");
+
+  check_chat(chat_id, AccessRights::Write, std::move(query),
+             [this, message_thread_id](int64 chat_id, PromisedQueryPtr query) {
+               send_request(make_object<td_api::unpinAllMessageThreadMessages>(chat_id, message_thread_id),
+                            td::make_unique<TdOnOkQueryCallback>(std::move(query)));
+             });
+  return Status::OK();
+}
+
 td::Status Client::process_get_chat_member_query(PromisedQueryPtr &query) {
   auto chat_id = query->arg("chat_id");
   TRY_RESULT(user_id, get_user_id(query.get()));
diff --git a/telegram-bot-api/Client.h b/telegram-bot-api/Client.h
index e283a69..555eb8f 100644
--- a/telegram-bot-api/Client.h
+++ b/telegram-bot-api/Client.h
@@ -544,6 +544,7 @@ class Client final : public WebhookActor::Callback {
   Status process_close_forum_topic_query(PromisedQueryPtr &query);
   Status process_reopen_forum_topic_query(PromisedQueryPtr &query);
   Status process_delete_forum_topic_query(PromisedQueryPtr &query);
+  Status process_unpin_all_forum_topic_messages_query(PromisedQueryPtr &query);
   Status process_get_chat_member_query(PromisedQueryPtr &query);
   Status process_get_chat_administrators_query(PromisedQueryPtr &query);
   Status process_get_chat_member_count_query(PromisedQueryPtr &query);