# Astro astro@5.17.0 — Release & Upgrade Intelligence
- **Product:** Astro (https://astro.build)
- **Version:** astro@5.17.0
- **Released:** Jan 29, 2026
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/astro/updates/astro-5.17.0/

## Executive Summary (TL;DR)
Astro astro@5.17.0. Source highlight: Adds support for returning a Promise from the `parser()` option of the `file()` loader

## New Features
- Adds support for returning a Promise from the `parser()` option of the `file()` loader
- Adds a new, optional `kernel` configuration option to select a resize algorithm in the Sharp image service
- Adds a new `partitioned` option when setting a cookie to allow creating partitioned cookies.
- Adds a new `retainBody` option to the `glob()` loader to allow reducing the size of the data store.
- Adds a new `background` property to the `<Image />` component.
- Adds optional `placement` config option for the dev toolbar.

## Upgrade Command
```bash
npm install --save-exact astro@5.17.0
```