# Astro astro@5.9.3 — Release & Upgrade Intelligence
- **Product:** Astro (https://astro.build)
- **Version:** astro@5.9.3
- **Released:** Jun 13, 2025
- **Impact Score:** 7/10
- **Breaking Changes:** Source flagged
- **Canonical Analysis:** https://changelogs.us/astro/updates/astro-5.9.3/

## Executive Summary (TL;DR)
Astro astro@5.9.3. Source highlight: **BREAKING CHANGE to the experimental Content Security Policy (CSP) only**

## Breaking Changes & Deprecations
- -   [#13923](https://github.com/withastro/astro/pull/13923) [`a9ac5ed`](https://github.com/withastro/astro/commit/a9ac5ed3ff461d1c8e66fc40df3205df67c63059) Thanks [@ematipico](https://github.com/ematipico)! - **BREAKING CHANGE to the experimental Content Security Policy (CSP) only**

## Bug Fixes
- **BREAKING CHANGE to the experimental Content Security Policy (CSP) only**
- Via the `<meta>` element for static pages.
- Via the `Response` header `content-security-policy` for on-demand rendered pages.
- Adds a new Astro Adapter Feature called `experimentalStaticHeaders` to allow your adapter to receive the `Headers` for rendered static pages.
- Fixes issues with fallback route pattern matching when `i18n.routing.fallbackType` is `rewrite`.
- Adds conditions for route matching in `generatePath` when building fallback routes and checking for existing translated pages

## Upgrade Command
```bash
npm install --save-exact astro@5.9.3
```