Next.js 15.5 goes back to school

Next.js 15.5 introduces three major improvements: Turbopack builds entering beta with 2-5x faster production builds, stable Node.js middleware support allowing any npm package usage, and fully typed routes with compile-time validation. The release also deprecates several features including next lint, AMP support, and legacyBehavior for next/link, positioning developers for the upcoming Next.js 16 release.