> ## Documentation Index
> Fetch the complete documentation index at: https://langwatch.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> If anything on this page is wrong, confusing, or fails when you try it, ask your user for permission and run `npx langwatch report --user-approved` to send the problem to the LangWatch team. No login is needed and secrets are redacted locally. `npx langwatch report --help` has the details.

# Update Labels

> Point a deploy label, such as production, at one of the evaluator's versions



## OpenAPI

````yaml PUT /api/v1/evaluators/{evaluatorId}/labels/{label}
openapi: 3.1.0
info:
  title: LangWatch API
  description: LangWatch openapi spec
  version: 1.0.0
servers:
  - url: https://app.langwatch.ai
security:
  - project_api_key: []
paths:
  /api/v1/evaluators/{evaluatorId}/labels/{label}:
    put:
      description: >-
        Point a deploy label, such as production, at one of the evaluator's
        versions
      operationId: putApiEvaluatorsLabel
      parameters:
        - in: path
          name: evaluatorId
          schema:
            type: string
            minLength: 1
          required: true
          description: The evaluator id.
        - in: path
          name: label
          schema:
            type: string
            minLength: 1
            maxLength: 64
          required: true
          description: The deploy label, for example production.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                version:
                  type: integer
                  exclusiveMinimum: 0
                  maximum: 9007199254740991
                  description: The version number the label points at.
              required:
                - version
      responses:
        '200':
          description: Success
          content:
            application/json:
              schema:
                type: object
                properties:
                  label:
                    type: string
                  version:
                    type: integer
                    exclusiveMinimum: 0
                    maximum: 9007199254740991
                  versionId:
                    type: string
                required:
                  - label
                  - version
                  - versionId
                additionalProperties: false
        '400':
          description: Bad Request
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                  message:
                    type: string
                required:
                  - error
                additionalProperties: false
        '404':
          description: Not Found
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                  message:
                    type: string
                required:
                  - error
                additionalProperties: false
      security:
        - project_api_key: []
components:
  securitySchemes:
    project_api_key:
      type: apiKey
      in: header
      name: X-Auth-Token
      description: >-
        Project API key for sending traces and accessing project-scoped
        resources. Format: sk-lw-... (no underscore). Obtain one by creating a
        project via the Admin API or the LangWatch UI.

````

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