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

# v26.3.16 — September 24, 2026

> Released September 24, 2026: Auto-restart fields removed from the API; The runtime version you choose is the one that runs

<Update label="v26.3.16" description="September 24, 2026">
  ### Auto-restart fields removed from the API

  Auto-restart has been on for every application on every plan since September 17. The leftover fields
  are now gone:

  * **Responses:** applications no longer include `auto_restart`. If your integration reads it, treat
    auto-restart as always on.
  * **Requests:** `autorestart` in `POST /v1/apps` and `auto_restart` in
    `PATCH /v1/apps/{id}/config` are no longer part of the API. Clients that still send them keep
    working — the field is simply ignored.
  * **SDKs and CLI:** the JavaScript, Python and Go SDKs drop the field, and the CLI drops the
    `--autorestart` flag.
  * **`vertracloud.config`:** an old `AUTORESTART` line is ignored and doesn't block the upload.

  ### The runtime version you choose is the one that runs

  The runtime version picked in the wizard, in the Config tab, in `VERSION` or through the API is now
  the version the application runs.

  * **Choosing the latest version runs the latest version.** Before, picking Node.js 24.5.0 or Ruby 3.4
    (the `latest` of each) could silently build the application on the recommended version instead.
  * **The version you confirm wins.** When a `.zip` has a `VERSION` in `vertracloud.config`, the
    wizard pre-fills it; if you pick another one before creating, the application now runs the one you
    picked — before, the file's value could override your choice.
  * **Unknown versions are refused.** A version that doesn't exist for the application's language
    answers `400 INVALID_VERSION` instead of quietly falling back to another one. See
    [List Runtimes](/api-reference/endpoint/apps/runtimes) for the valid values.

  <Warning>
    An application created with Node.js 24.5.0 or Ruby 3.4 that was running on the recommended version
    switches to the version it chose on its **next deploy, rebuild or restart**. If it depends on the
    older runtime, set the version to `recommended` in the Config tab before restarting.
  </Warning>
</Update>