Next.js 15.5 adds Turbopack builds in beta, stable Node.js middleware, and much more

Next.js has released version 15.5, introducing several updates aimed at developers building for the web with React. This release debuts the next build --turbopack command in beta, which enables Turbopack to drive preview and production deployment builds for Vercel websites. The result is faster iteration cycles and shorter build times.

Following earlier experimental support, Next.js 15.5 now offers stable support for the Node.js middleware runtime. This upgrade comes after extensive production testing and allows middleware developers to confidently adopt the Node.js runtime in their applications.

Building on these enhancements, the new version significantly improves TypeScript experience within the App Router. Next.js 15.5 provides comprehensive type safety and ensures full compatibility with Turbopack, streamlining routing development for TypeScript projects.

For those managing code quality, this release marks the deprecation of the next lint command. Developers will now encounter a deprecation warning and are advised to migrate to explicit ESLint configurations or consider Biome, a fast alternative. Additionally, deprecation warnings are visible in development and build logs to ensure teams have time to adapt ahead of breaking changes in Next.js 16.