---
title: "Updates a Milestone"
method: PUT
path: "/Projects/{id}/Milestones"
tags: ["Projects"]
---

# Updates a Milestone

`PUT /Projects/{id}/Milestones`

## Request

- Base URL: `https://api.insightly.com/v3.1`
- URL: `https://api.insightly.com/v3.1/Projects/{id}/Milestones`
- Auth: none declared. Required headers: `Authorization`

## Path parameters

- `id` integer, required

## Headers

- `Authorization` string, required

## Request body

- APIMilestone
  - `MILESTONE_ID` integer
  - `TITLE` string, string
  - `COMPLETED` boolean, required
  - `DUE_DATE` string, date-time, required
  - `OWNER_USER_ID` integer
  - `DATE_CREATED_UTC` string, date-time
  - `DATE_UPDATED_UTC` string, date-time
  - `COMPLETED_DATE_UTC` string, date-time
  - `PROJECT_ID` integer
  - `RESPONSIBLE_USER` integer

## Response `200`

Request succeeded.

- APIMilestone[]
  - `MILESTONE_ID` integer
  - `TITLE` string, string
  - `COMPLETED` boolean, required
  - `DUE_DATE` string, date-time, required
  - `OWNER_USER_ID` integer
  - `DATE_CREATED_UTC` string, date-time
  - `DATE_UPDATED_UTC` string, date-time
  - `COMPLETED_DATE_UTC` string, date-time
  - `PROJECT_ID` integer
  - `RESPONSIBLE_USER` integer

## Other responses

- `400`: Data validation error.
- `401`: Authentication failed.
- `403`: API User does not have access to Record.
- `404`: Record or Milestone not found.

---

[API](https://skmtc.dev/insightly/apis/insightly-api-v3-1.md) - [All operations](https://skmtc.dev/insightly/apis/insightly-api-v3-1/llms.txt) - [OpenAPI document](https://skmtc.dev/insightly/apis/insightly-api-v3-1/revisions/e7df0c3b65fb?raw)