Vercel Sandbox now support Custom Images

Vercel Sandbox has expanded its capabilities to support custom images, allowing developers to use personalized or pre-configured container images for their sandbox environments. This feature enables greater flexibility in setting up development and testing environments by supporting custom Docker images alongside default configurations. The update was announced in the Vercel changelog as part of the platform's ongoing development of its sandbox infrastructure.

Source: Vercel Blog | 2026-06-30