---
title: V4.9.9
description: FastGPT V4.9.9 Release Notes
---

## Upgrade Guide

### 1. Back Up Your Data

### 2. Pro Edition Users: Replace Your License

Pro edition users can contact the FastGPT team for a license replacement plan. After replacement, you can upgrade the system directly — the admin panel will prompt you to enter the new license.

### 3. Update Image Tags

- Update FastGPT image tag: v4.9.9
- Update FastGPT Pro image tag: v4.9.9
- mcp_server: no update required
- Sandbox: no update required
- AIProxy: no update required

## New Features

1. Switched from JWT to SessionId-based login authentication, with configurable maximum concurrent client sessions.
2. New Pro edition license management model.
3. WeChat Official Account calls now display and log chat conversation errors for easier troubleshooting.
4. API knowledge base now supports BasePath selection. Requires an additional API endpoint — see [API Knowledge Base Introduction](/docs/introduction/guide/knowledge_base/api_dataset/#4-获取文件详细信息用于获取文件信息) for details.

## Improvements

1. Optimized tool call logic for new tool detection.
2. Adjusted citation prompt text.

## Bug Fixes

1. Unable to retrieve app history save/publish records.
2. Member MCP tool creation permission issues.
3. Source citation display passing incorrect IDs, causing "no permission to access this file" errors.
4. Answer annotation frontend data errors.
