# override_dynamic_variables on PATCH /v2/update-call/{} stops working

Calls to PATCH /v2/update-call/{}, body parameter override_dynamic_variables on Retell AI API stopped working on August 31, 2026.

- API: Retell AI API (api.retellai.com)
- Kind: Endpoint removal
- Takes effect: August 31, 2026
- Calls after that day: fail
- Calls it hits: `PATCH /v2/update-call/{}`, `body parameter override_dynamic_variables`
- Source: [Announcement](https://docs.retellai.com/deprecation-notice/2026/08-31_update_call_ended_calls_only)
- Page: https://www.okapi.bot/providers/retell-ai-api/breaking-changes/override-dynamic-variables-on-patch-v2-update-call-stops-working/

## What to use instead

Send it to PATCH /v2/update-live-call/{call_id} under fields_to_override.override_dynamic_variables for an ongoing call; drop it for an ended call.

## Retell AI API's words

> 3. The `override_dynamic_variables` input on Update Call will no longer be accepted.