Next.js 15.4: Production-Ready Turbopack with 100% Integration Test Compatibility

Next.js 15.4 Launches Production-Ready Turbopack

Next.js 15.4 delivers a critical milestone for the Turbopack bundler: next build --turbopack now passes all 8,298 official Next.js integration tests, signaling that Turbopack is no longer experimental and is ready for production use—Vercel itself is using it to power its high-traffic site (nextjs.org). This achievement not only validates Turbopack’s stability and correctness across edge cases but also sets the stage for it to become the default bundler in Next.js 16.

Developers upgrading to Next.js 15.4 benefit immediately from under-the-hood performance and stability improvements. The release focuses on:

• Production readiness: Full test coverage ensures reliability in diverse real-world applications.
• Stability fixes: Numerous bug fixes and optimizations address issues reported by early adopters.
• Smooth upgrade path: Use npx @next/codemod@canary upgrade latest or simply npm install next@latest react@latest react-dom@latest to adopt the latest version with minimal friction (nextjs.org).

Read the full release notes on the Next.js 15.4 blog.