# Astro astro@6.4.3 — Release & Upgrade Intelligence
- **Product:** Astro (https://astro.build)
- **Version:** astro@6.4.3
- **Released:** Jun 02, 2026
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/astro/updates/astro-6.4.3/

## Executive Summary (TL;DR)
Astro astro@6.4.3. Source highlight: Bumps `devalue` dependency to v5.8.1

## Bug Fixes
- Bumps `devalue` dependency to v5.8.1
- Fix a false positive in the dev toolbar accessibility audit for anchors with text inside closed `<details>` elements.
- Fixes a bug where `experimental.advancedRouting` with `astro/hono` handlers threw `TypeError: Cannot read properties of undefined (reading 'route')` for unmatched routes instead of rendering the custom 404 page.
- Fixes a false "does not call the middleware() handler" warning when using `astro()` in a custom `src/app.ts` and the first request is a redirect route.
- Fixes `redirectToDefaultLocale` not working after the Advanced Routing refactoring.
- Improves optimized fallbacks generation when using the Fonts API by using better metrics for bold variants

## Upgrade Command
```bash
npm install --save-exact astro@6.4.3
```