curl -X PATCH 'https://api.github.com/orgs/example-org/properties/installations/values/example-property-name' \
  -H "Authorization: Bearer $GITHUB_TOKEN" \
  -H 'Accept: application/vnd.github+json' \
  -H 'X-GitHub-Api-Version: 2026-03-10' \
  -H 'Content-Type: application/json' \
  -d '{
  "repository_values": [
    {
      "repository_name": "example-repository-name",
      "value": "example-value"
    }
  ]
}'

# PATCH /orgs/{org}/properties/installations/values/{property_name} (GitHub API)
Base URL: https://api.github.com
Auth: Authorization; GitHub token; required.
Request formats: application/json.
Last verified: 2026-09-29

> Create or update external custom property values for a property across organization repositories

## Critical Gotchas
* GitHub recommends an `Accept: application/vnd.github+json` header and an explicit `X-GitHub-Api-Version` header.
* Fine-grained tokens only authorize repositories and permissions selected when the token is created.

## cURL
curl -X PATCH 'https://api.github.com/orgs/example-org/properties/installations/values/example-property-name' \
  -H "Authorization: Bearer $GITHUB_TOKEN" \
  -H 'Accept: application/vnd.github+json' \
  -H 'X-GitHub-Api-Version: 2026-03-10' \
  -H 'Content-Type: application/json' \
  -d '{
  "repository_values": [
    {
      "repository_name": "example-repository-name",
      "value": "example-value"
    }
  ]
}'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| org | path | string | Yes | The organization name. The name is not case sensitive. |
| property_name | path | string | Yes | The name of the external custom property |
| repository_values | body | object[] | Yes | The names of repositories and the values that the named external custom prope... |

## Response example
null

---
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PATCH

PATCH /orgs/{org}/properties/installations/values/{property_name} — GitHub API

GitHub token (required); https://api.github.com

GitHub API

Create or update external custom property values for a property across organization repositories

Base URL: https://api.github.com
Auth: Authorization: Bearer <GITHUB_API_KEY>
Last verified: 2026-09-29 · upstream hash matched

Actions Try in browser→

Agents: curl -H "Accept: text/markdown" this URL
→ 253 tokens · Vary: Accept

Critical gotchas

GitHub recommends an Accept: application/vnd.github+json header and an explicit X-GitHub-Api-Version header.

Fine-grained tokens only authorize repositories and permissions selected when the token is created.

cURL

curl -X PATCH 'https://api.github.com/orgs/example-org/properties/installations/values/example-property-name' \  -H "Authorization: Bearer $GITHUB_TOKEN" \  -H 'Accept: application/vnd.github+json' \  -H 'X-GitHub-Api-Version: 2026-03-10' \  -H 'Content-Type: application/json' \  -d '{  "repository_values": [    {      "repository_name": "example-repository-name",      "value": "example-value"    }  ]}'

Parameters

Name	In	Type	Required	Description
org	path	string	Yes	The organization name. The name is not case sensitive.
property_name	path	string	Yes	The name of the external custom property
repository_values	body	object[]	Yes	The names of repositories and the values that the named external custom property will be set to.

Response 200 OK

null

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