# Astro 4.9

DevFeed: [Astro 4.9](<https://devfeed.tech/articles/astro-4-9-3215.md>)

Original publisher: [Read original article](<https://astro.build/blog/astro-490/>)

Author: Erika; Emanuele Stoppa; Matthew Phillips; Nate Moore; Bjorn Lu; Sarah Rainsberger

Published: 2024-05-23T00:00:00Z

Content type: release

Language: en

Sources: [The Astro Blog](<https://devfeed.tech/sources/the-astro-blog.md>)

Topics: [Astro](<https://devfeed.tech/topics/astro.md>), [API](<https://devfeed.tech/topics/api.md>), [React](<https://devfeed.tech/topics/react.md>), [Testing](<https://devfeed.tech/topics/testing.md>), [Vite](<https://devfeed.tech/topics/vite.md>)

Tags: [api](<https://devfeed.tech/tags/api.md>), [astro](<https://devfeed.tech/tags/astro.md>), [cli](<https://devfeed.tech/tags/cli.md>), [experimental](<https://devfeed.tech/tags/experimental.md>), [react](<https://devfeed.tech/tags/react.md>), [release](<https://devfeed.tech/tags/release.md>), [testing](<https://devfeed.tech/tags/testing.md>), [vite](<https://devfeed.tech/tags/vite.md>)

## AI overview

Astro 4.9 introduces the experimental Container API for rendering Astro components outside an Astro application, with an emphasis on testing components in Vite-powered frameworks such as Vitest. The release also adds full React 19 support, stabilizes experimental features, and includes upgrade guidance through the CLI or package manager.

## Source excerpt

Astro 4.9 is now available! This release includes the long-awaited Container API, stabilized experimental features, and more.