---
title: "Update One Maintenance Window for One Project"
method: PATCH
path: "/api/atlas/v2/groups/{groupId}/maintenanceWindow"
tags: ["Maintenance Windows"]
---

# Update One Maintenance Window for One Project

`PATCH /api/atlas/v2/groups/{groupId}/maintenanceWindow`

Updates the maintenance window for the specified project. Urgent maintenance activities such as security patches can't wait for your chosen window. MongoDB Cloud starts those maintenance activities when needed. After you schedule maintenance for your cluster, you can't change your maintenance window until the current maintenance efforts complete. The maintenance procedure that MongoDB Cloud performs requires at least one replica set election during the maintenance window per replica set. Maintenance always begins as close to the scheduled hour as possible, but in-progress cluster updates or unexpected system issues could delay the start time. Updating the maintenance window will reset any maintenance deferrals for this project.

## Path parameters

- `groupId` string, required

## Query parameters

- `envelope` boolean

## Response `200`

OK

## Other responses

- `400` — Bad Request.
- `401` — Unauthorized.
- `403` — Forbidden.
- `404` — Not Found.
- `429` — Too Many Requests.
- `500` — Internal Server Error.

---

[API](https://skmtc.dev/mongodb/apis/atlas-admin-api.md) · [All operations](https://skmtc.dev/mongodb/apis/atlas-admin-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/mongodb/atlas-admin-api/revisions/e37e8ef8429f/schema)