# Update flow version

`PATCH` `/api/v1/crm-connections/{crm_connection_id}/flows/{flow_id}/versions/{version_id}`

Update a flow version by submitting a complete metadata object. The metadata
must include all fields, not just the ones being changed — fetch the current
metadata via get_flow_version first, modify what you need, then submit the
full object. Returns 204 on success. Active versions cannot be edited.

## Path parameters

| Name | Type | Required | Description |
|------|------|----------|-------------|
| crm_connection_id | string | yes | UUID of the CRM connection |
| flow_id | string | yes | DurableId of the flow definition |
| version_id | string | yes | DurableId of the flow version, as returned in the durable_id field of list_flow_versions |

## Request body

`application/json`

| Field | Type | Required | Description |
|-------|------|----------|-------------|
| metadata | object | yes | Complete flow metadata object. Fetch the current metadata via get_flow_version first, modify what you need, then submit the full object — not just the changed fields. |

## Response

`204 No Content` — `application/json`

_No response body._

## Errors

| Status | Description |
|--------|-------------|
| 400 | Bad Request |
| 403 | Forbidden |
| 404 | Not Found |
| 422 | Unprocessable Entity |
| 502 | Bad Gateway |