Fixing the ERESOLVE Dependency Error in Next.js 15 Vercel Deployments

The Problem

When deploying Next.js 15 applications to Vercel, you might encounter an ERESOLVE error during the build process, particularly with package and React dependencies. This usually occurs due to conflicting peer dependencies between packages.

Quick Solution

Here's how to resolve this issue:

1. Navigate to your project's settings in Vercel dashboard

2. Find the "Build & Development Settings" section

3. Look for the "Install Command" field

4. Override the default by entering: npm install --force

5. Redeploy your application

Why This Works

The --force flag tells npm to bypass dependency conflicts and proceed with the installation anyway. While this isn't always the best practice for local development, it's often necessary for deployment scenarios where package conflicts need to be overridden.

Important Notes

• Only use this solution if you're confident about your package versions

• Consider reviewing your package dependencies for a more permanent solution

• This fix is specifically for Next.js 15 deployments on Vercel

Alternative Approaches

For a more sustainable solution, you might want to:

• Update your dependencies to compatible versions

• Use package resolutions in your package.json

• Consider using yarn instead of npm

Remember: The --force flag should be used as a temporary solution while you work on resolving the underlying dependency conflicts.

Got questions? Feel free to reach out in the comments below!