-If a model expires that is used by a [custom speech endpoint](how-to-custom-speech-train-model.md), then the service will automatically fall back to using the latest base model for the language you are using. To update a model you are using, you can select **Deployment** in the **Custom Speech** menu at the top of the page and then click on the endpoint name to see its details. At the top of the details page, you will see an **Update Model** button that lets you seamlessly update the model used by this endpoint without downtime. You can also make this change programmatically by using the [**Update Model**](https://westus.dev.cognitive.microsoft.com/docs/services/speech-to-text-api-v3-0/operations/UpdateModel) Rest API.
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