# Update all user attributes

Replaces a user's attributes. This will replace any existing attributes for the user with the attributes in the payload.
To leave existing attributes in place, use PATCH.

Endpoint: PUT /v3/users/{user_id}/attributes
Version: 2026-03-27
Security: ZephrHmacHttp

## Path parameters:

  - `user_id` (string, required)
    Unique User identifier

## Request fields (application/json):

  - `first_name` (string)
    Example: "Joe"

  - `surname` (string)
    Example: "Blow"


## Response 200 fields

## Response 400 fields

## Response 404 fields