---
title: "Changes to Cancel an operation"
method: PUT
path: "/v0/operations/{operationId}/"
---

# Changes to Cancel an operation

`PUT /v0/operations/{operationId}/`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 1 of 6 revisions.

- **2026-09-03** `6b55f43485ae`: 5 breaking

## Changes

- **2026-09-03** `6b55f43485ae`: 5 breaking
  - added the new required request property `reason`
  - the request property `state` became required
  - removed the enum value `FAILED` of the request property `state`
  - removed the enum value `SCHEDULED` of the request property `state`
  - removed the enum value `TIMEOUT` of the request property `state`

---

[Operation](https://skmtc.dev/esper/apis/esper-api-reference/docs/v0/operations/:operationId/put.md) - [API](https://skmtc.dev/esper/apis/esper-api-reference.md) - [Page](https://skmtc.dev/esper/apis/esper-api-reference/changes/v0/operations/:operationId/put)