Vercel Stopped Deploying. No Alert. No Error. Just Old Code.

📰 Dev.to · Ted

Learn how a single line in vercel.json can cause silent build failures in Vercel, and how to troubleshoot the issue

intermediate Published 20 May 2026

Action Steps

Check vercel.json for any incorrect or outdated configurations
Verify Vercel build logs for any signs of failure or error
Test deployment with a minimal vercel.json configuration to isolate the issue
Use Vercel's debugging tools to identify the root cause of the silent build failure
Update vercel.json with the correct configuration to resolve the issue

Who Needs to Know This

Developers and DevOps teams using Vercel for deployment can benefit from understanding this common pitfall and how to resolve it

Key Insight

💡 A single incorrect line in vercel.json can cause Vercel to fail silently, serving old code instead of the latest build

Key Takeaways

Learn how a single line in vercel.json can cause silent build failures in Vercel, and how to troubleshoot the issue

Full Article

Every push to GitHub went through fine. Vercel showed a healthy project. The site was quietly serving a build from two weeks ago. One line in vercel.json was causing every build to fail silently.

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