# Helix 1.16.0: Zod 4 support

> Define your Helix schemas with Zod 4. New projects scaffold it, and existing Zod 3 projects keep working, so you can migrate when it suits you.

- Released: 28 Oct 2026 (2026-10-28)
- Packages: @trayai/helix-cli@1.16.0, @trayai/helix-sdk@1.16.0

## Headline changes

### Changed: Zod 4 support

Define your function and tool schemas with Zod 4. `defineFunction`, `defineTool`, and `DefineFunctionOptions` accept Zod 4 schemas, and your existing Zod 3 schemas keep working, so you can upgrade when it suits you. New projects from `helix init` scaffold `zod@^4.6.6`.

Docs: https://helix.tray.ai/documentation/guides/migrating-to-zod-4/

## Other changes

### Security

- The CLI and SDK now depend on `zod@^4.6.6`, clearing advisory GHSA-mrhx-c7xc-m3w5 (docs: https://helix.tray.ai/documentation/guides/migrating-to-zod-4/)

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Canonical: https://helix.tray.ai/documentation/releases/1160/
This file: https://helix.tray.ai/documentation/releases/1160.md
The full changelog: https://helix.tray.ai/documentation/releases.md