---
title: V4.1
description: Upgrade guide from older versions to FastGPT V4.1
---

If you are **upgrading from an older version to V4.1**, the chat storage structure has been redesigned. You'll need to initialize the existing stored data.

## Update Environment Variables

V4.1 simplified the PostgreSQL and MongoDB connection variables — you now only need a single URL for each:

Note: `/fastgpt` and `/postgres` refer to database names and must match the values from your previous configuration.

```bash
# MongoDB config — no changes needed. If connection fails, try removing ?authSource=admin
- MONGODB_URI=mongodb://username:password@mongo:27017/fastgpt?authSource=admin
# PostgreSQL config — no changes needed
- PG_URL=postgresql://username:password@pg:5432/postgres
```

## Initialization API

Deploy the new version, then send 1 HTTP request (remember to include `headers.rootkey` — this value comes from your environment variables):

- https://xxxxx/api/admin/initChatItem