diff --git a/src/api/gramjs/updater.ts b/src/api/gramjs/updater.ts
index 6bbec5b09..6c36480a0 100644
--- a/src/api/gramjs/updater.ts
+++ b/src/api/gramjs/updater.ts
@@ -594,6 +594,15 @@ export function updater(update: Update, originRequest?: GramJs.AnyRequest) {
         lastReadOutboxMessageId: update.maxId,
       },
     });
+  } else if (update instanceof GramJs.UpdateReadChannelDiscussionInbox) {
+    onUpdate({
+      '@type': 'updateThreadInfo',
+      chatId: buildApiPeerId(update.channelId, 'channel'),
+      threadId: update.topMsgId,
+      threadInfo: {
+        lastReadInboxMessageId: update.readMaxId,
+      },
+    });
   } else if (
     update instanceof GramJs.UpdateDialogPinned
     && update.peer instanceof GramJs.DialogPeer
diff --git a/src/global/actions/apiUpdaters/messages.ts b/src/global/actions/apiUpdaters/messages.ts
index b83d1727a..782e38c8a 100644
--- a/src/global/actions/apiUpdaters/messages.ts
+++ b/src/global/actions/apiUpdaters/messages.ts
@@ -361,6 +361,11 @@ addActionHandler('apiUpdate', (global, actions, update): ActionReturnType => {
         global = replaceThreadParam(global, chatId, threadId, 'firstMessageId', firstMessageId);
       }
 
+      const chat = selectChat(global, chatId);
+      if (chat?.isForum && threadInfo.lastReadInboxMessageId !== currentThreadInfo?.lastReadInboxMessageId) {
+        actions.loadTopicById({ chatId, topicId: threadId });
+      }
+
       setGlobal(global);
 
       break;