How to fix npm ERR! code EVERSIONMISMATCH npm ERR! Dependency version mismatch in npm

npmINTERMEDIATEMEDIUMUpdated Dec 6, 2025· 206 views

Version mismatch errors occur when npm cannot resolve conflicting version requirements between packages. Use --legacy-peer-deps for a quick fix, or update packages to compatible versions for a proper solution.

Quick fix

Fixes ERESOLVE

npm install --legacy-peer-deps
  1. Use --legacy-peer-deps for quick fix
  2. Understand the conflict
  3. Update conflicting packages
  4. Clean install from scratch
npm — error
npm install --legacy-peer-deps
npm ERR! code EVERSIONMISMATCH
npm ERR! Dependency version mismatch
shell
npm install --legacy-peer-deps

What this error means

This error occurs when npm's dependency resolver cannot find versions that satisfy all requirements. Package A might need lodash@^3.0.0 while Package B needs lodash@^4.0.0—and there's no single version that satisfies both. Starting with npm 7, peer dependency conflicts became errors instead of warnings (as they were in npm 6). This stricter behavior catches potential runtime issues earlier but can make upgrading packages more challenging. The error often appears after updating a package, adding a new dependency, or upgrading npm itself from version 6 to 7+.

Typical symptoms

  • npm install fails with ERESOLVE or version conflict errors
  • Error message shows two packages requiring different versions
  • Installation worked with npm 6 but fails with npm 7+
  • Adding a new package breaks existing dependencies
  • CI/CD pipeline fails after npm version upgrade
  • Error mentions peer dependency conflicts

Common causes

  1. Packages require incompatible versions of shared dependency
  2. Peer dependency conflicts between packages
  3. npm 7+ stricter resolution (previously just warnings)
  4. Outdated packages not compatible with newer dependencies
  5. Mixing packages from different ecosystem generations
  6. Node.js version changed affecting native module compatibility

How to fix "npm ERR! code EVERSIONMISMATCH npm ERR! Dependency version mismatch"

1Use --legacy-peer-deps for quick fix

Bypass strict peer dependency resolution:

bash
npm install --legacy-peer-deps

This reverts to npm 6's behavior where conflicts are warnings, not errors. It's a quick fix but may hide real compatibility issues.

To make it permanent (not recommended for all projects):

bash
npm config set legacy-peer-deps true
2Understand the conflict

Read the error message carefully. It shows exactly what conflicts:

bash
npm ERR! ERESOLVE could not resolve
npm ERR! Found: react@17.0.2
npm ERR! peer react@"^18.0.0" from react-dom@18.0.0

This tells you react-dom@18 needs React 18, but you have React 17.

3Update conflicting packages

Upgrade packages to versions that work together:

bash
# Check available versions
npm view react-dom versions

# Update to compatible versions
npm install react@18 react-dom@18

Or downgrade the newer package:

bash
npm install react-dom@17
4Clean install from scratch

Sometimes stale dependencies cause conflicts:

bash
rm -rf node_modules package-lock.json
npm cache clean --force
npm install

This resolves dependencies fresh without cached decisions.

5Use npm overrides for transitive dependencies

Force specific versions for nested dependencies (npm 8.3+):

json
{
  "overrides": {
    "lodash": "4.17.21"
  }
}

This tells npm to use lodash 4.17.21 everywhere, regardless of what individual packages request.

Caution: This may cause runtime issues if packages truly need different versions.

6Use --force as last resort

Force installation ignoring all conflicts:

bash
npm install --force

Warning: This can create broken installations. Only use for debugging or when you're certain the conflicts don't matter.

Advanced notes

npm 6 vs npm 7+ behavior:

npm 6 treated peer dependency conflicts as warnings and installed anyway. npm 7+ treats them as errors by default. This is actually better—it catches incompatibilities before runtime.

For native modules (N-API, node-gyp):

If the error mentions native modules or Node.js version mismatches:

bash
# Rebuild native modules
npm rebuild

# Or clear everything and reinstall
rm -rf node_modules
npm install

In CI/CD pipelines:

Use npm ci instead of npm install for consistent builds:

bash
npm ci --legacy-peer-deps  # If needed

Long-term solution:

Rather than relying on --legacy-peer-deps, gradually update packages to compatible versions. Use npm outdated to identify what needs updating and test updates in a branch before merging.

Frequently asked questions

What does "ERESOLVE" mean?
This error occurs when npm's dependency resolver cannot find versions that satisfy all requirements. 0—and there's no single version that satisfies both. Starting with npm 7, peer dependency conflicts became errors instead of warnings (as they were in npm 6).
How do I fix "ERESOLVE"?
Version mismatch errors occur when npm cannot resolve conflicting version requirements between packages. Use --legacy-peer-deps for a quick fix, or update packages to compatible versions for a proper solution.
What causes "ERESOLVE"?
Packages require incompatible versions of shared dependency Peer dependency conflicts between packages npm 7+ stricter resolution (previously just warnings)
Is the "ERESOLVE" error serious?
It is a medium-severity error — more of a blocker than a risk. The steps above resolve it.

Official resources & further reading