Astro 5.15 brings Netlify skew protection, new adapter APIs, and granular font preloading

Astro 5.15 is now available, delivering new features and backend enhancements for this open source web framework focused on content-driven websites. A major highlight is automatic skew protection for Netlify deployments. This mechanism keeps client and server code synchronized on deployments, reducing the risk of subtle bugs from users loading outdated assets alongside new server code.

Following this improvement, Astro 5.15 enables hosting platforms to leverage new core APIs. These APIs allow adapters to customize response headers and asset query parameters. As a result, platforms like Netlify can now introduce sophisticated deployment features without requiring developers to manually configure settings.

Building on these core updates, the experimental Fonts API in Astro 5.15 now allows developers to precisely define which font weights, styles, and subsets to preload. This replaces the previous all-or-nothing approach and helps optimize loading performance by limiting downloads to only necessary font variants.

The latest release also incorporates a range of other enhancements and bug fixes. These updates continue to refine the developer experience and stability across the Astro framework.