---
title: "UpgradeClient defines a rpc handler method for MsgUpgradeClient."
method: POST
path: "/ibc.core.client.v1.Msg/UpgradeClient"
tags: ["Msg"]
---

# UpgradeClient defines a rpc handler method for MsgUpgradeClient.

`POST /ibc.core.client.v1.Msg/UpgradeClient`

## Request body

- IbcCoreClientV1MsgUpgradeClient
  - `client_id` string
  - `client_state` GoogleProtobufAny
    - `@type` string
  - `consensus_state` GoogleProtobufAny
    - `@type` string
  - `proof_upgrade_client` string, byte
  - `proof_upgrade_consensus_state` string, byte
  - `signer` string

## Response `200`

A successful response.

- IbcCoreClientV1MsgUpgradeClientResponse — MsgUpgradeClientResponse defines the Msg/UpgradeClient response type.

## Other responses

- `default` — An unexpected error response.

## Changes

- **2024-08-14** `21c607e4fa20` — 1 info
  - api operation id `IbcCoreClientV1Msg_UpgradeClient` removed and replaced with `FeeMsg_UpgradeClient`
- **2024-02-23** `54713b4a9d25` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/pokt-network/apis/http-api-console/changes/ibc.core.client.v1.Msg/UpgradeClient/post.md)

---

[API](https://skmtc.dev/pokt-network/apis/http-api-console.md) · [All operations](https://skmtc.dev/pokt-network/apis/http-api-console/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/pokt-network/http-api-console/revisions/21c607e4fa20/schema)