Pantheon now supports Bun as a package manager for Next.js sites, alongside npm, yarn, and pnpm. We've also added support for Node.js 26 (LTS).
Bun support
To use Bun, add a bun.lock file to your repository. Pantheon automatically detects the lock file and uses Bun to install your dependencies during the build process.
You can specify a Bun version in the engines.bun or packageManager field of your package.json. If no version is specified, Pantheon defaults to the latest stable release.
Node.js 26 support
Node.js 26 is now available as an LTS runtime for Next.js sites. Set the engines.node field in your package.json to use it:
Node.js 20 removed
Node.js 20 has reached end of life and is no longer available as a runtime. Sites using Node.js 20 must upgrade to Node.js 22 or later.
For more details about Next.js on Pantheon, see our Next.js documentation.