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npm version Build Status Coverage Status

npm-check-updates upgrades your package.json dependencies to the latest versions, ignoring specified versions.

  • maintains existing semantic versioning policies, i.e. "react": "^16.0.4" to "react": "^18.2.0".
  • only modifies package.json file. Run npm install to update your installed packages and package-lock.json.
  • clean output
  • sensible defaults
  • lots of options for custom behavior
  • CLI and module usage
  • compatible with npm, yarn, and pnpm


  • Red = major upgrade (and all major version zero)
  • Cyan = minor upgrade
  • Green = patch upgrade


Install globally:

npm install -g npm-check-updates

Or run with npx:

npx npm-check-updates


Show all new dependencies (excluding peerDependencies) for the project in the current directory:

$ ncu
Checking package.json
[====================] 5/5 100%

 eslint             7.32.0  →    8.0.0
 prettier           ^2.7.1  →   ^3.0.0
 svelte            ^3.48.0  →  ^3.51.0
 typescript         >3.0.0  →   >4.0.0
 untildify          <4.0.0  →   ^4.0.0
 webpack               4.x  →      5.x

Run ncu -u to upgrade package.json

Upgrade a project's package file:

Make sure your package file is in version control and all changes have been committed. This will overwrite your package file.

$ ncu -u
Upgrading package.json
[====================] 1/1 100%

 express           4.12.x  →   4.13.x

Run npm install to install new versions.

$ npm install      # update installed packages and package-lock.json

Check global packages:

ncu -g

Filter packages using the --filter option or adding additional cli arguments. You can exclude specific packages with the --reject option or prefixing a filter with !. Supports strings, wildcards, globs, comma-or-space-delimited lists, and regular expressions:

# upgrade only mocha
ncu mocha
ncu -f mocha
ncu --filter mocha

# upgrade packages that start with "react-"
ncu react-*
ncu "/^react-.*$/"

# upgrade everything except nodemon
ncu \!nodemon
ncu -x nodemon
ncu --reject nodemon

# upgrade only chalk, mocha, and react
ncu chalk mocha react
ncu chalk, mocha, react
ncu -f "chalk mocha react"

# upgrade packages that do not start with "react-".
ncu \!react-*
ncu '/^(?!react-).*$/' # mac/linux
ncu "/^(?!react-).*$/" # windows

How dependency updates are determined

  • Direct dependencies are updated to the latest stable version:
    • 1.21.3
  • Range operators are preserved and the version is updated:
    • ^1.2.0^2.0.0
    • 1.x2.x
    • >0.2.0>0.3.0
  • "Less than" is replaced with a wildcard:
    • <2.0.0^3.0.0
    • 1.0.0 < 2.0.0^3.0.0
  • "Any version" is preserved:
    • **
  • Prerelease and deprecated versions are ignored by default.
    • Use --pre to include prerelease versions (e.g. alpha, beta, build1235)
    • Use --deprecated to include deprecated versions
  • With --target minor, only update patch and minor:
  • With --target patch, only update patch:
  • With --target @next, update to the version published on the next tag:
    • 0.1.0 -> 0.1.1-next.1


--cache                    Cache versions to a local cache file. Default
                           --cacheFile is ~/.ncu-cache.json and default
                           --cacheExpiration is 10 minutes.
--cacheClear               Clear the default cache, or the cache file
                           specified by --cacheFile.
--cacheExpiration <min>    Cache expiration in minutes. Only works with
                           --cache. (default: 10)
--cacheFile <path>         Filepath for the cache file. Only works with
                           --cache. (default: "~/.ncu-cache.json")
--color                    Force color in terminal.
--concurrency <n>          Max number of concurrent HTTP requests to
                           registry. (default: 8)
--configFileName <s>       Config file name. (default:
--configFilePath <path>    Directory of .ncurc config file. (default:
                           directory of `packageFile`)
--cwd <path>               Working directory in which npm will be executed.
--deep                     Run recursively in current working directory.
                           Alias of (--packageFile '**/package.json').
--dep <value>              Check one or more sections of dependencies only:
                           dev, optional, peer, prod, or packageManager
                           (comma-delimited). (default:
--deprecated               Include deprecated packages.
-d, --doctor               Iteratively installs upgrades and runs tests to
                           identify breaking upgrades. Requires "-u" to
                           execute. Run "ncu --help --doctor" for details.
--doctorInstall <command>  Specifies the install script to use in doctor
                           mode. (default: npm install/yarn)
--doctorTest <command>     Specifies the test script to use in doctor mode.
                           (default: npm test)
--enginesNode              Include only packages that satisfy engines.node as
                           specified in the package file.
-e, --errorLevel <n>       Set the error level. 1: exits with error code 0 if
                           no errors occur. 2: exits with error code 0 if no
                           packages need updating (useful for continuous
                           integration). (default: 1)
-f, --filter <p>           Include only package names matching the given
                           string, wildcard, glob, comma-or-space-delimited
                           list, /regex/, or predicate function.
--filterVersion <p>        Filter on package version using
                           comma-or-space-delimited list, /regex/, or
                           predicate function.
--format <value>           Modify the output formatting or show additional
                           information. Specify one or more comma-delimited
                           values: group, ownerChanged, repo, time, lines.
                           Run "ncu --help --format" for details. (default:
-g, --global               Check global packages instead of in the current
--groupFunction <fn>       Customize how packages are divided into groups
                           when using '--format group'. Run "ncu --help
                           --groupFunction" for details.
-i, --interactive          Enable interactive prompts for each dependency;
                           implies -u unless one of the json options are set.
-j, --jsonAll              Output new package file instead of human-readable
--jsonDeps                 Like `jsonAll` but only lists `dependencies`,
                           `devDependencies`, `optionalDependencies`, etc of
                           the new package data.
--jsonUpgraded             Output upgraded dependencies in json.
-l, --loglevel <n>         Amount to log: silent, error, minimal, warn, info,
                           verbose, silly. (default: "warn")
--mergeConfig              Merges nested configs with the root config file
                           for --deep or --packageFile options. (default:
-m, --minimal              Do not upgrade newer versions that are already
                           satisfied by the version range according to
--packageData <value>      Package file data (you can also use stdin).
--packageFile <path|glob>  Package file(s) location. (default:
-p, --packageManager <s>   npm, yarn, pnpm, deno, staticRegistry (default:
                           npm). Run "ncu --help --packageManager" for
--peer                     Check peer dependencies of installed packages and
                           filter updates to compatible versions. Run "ncu
                           --help --peer" for details.
--pre <n>                  Include prerelease versions, e.g. -alpha.0,
                           -beta.5, -rc.2. Automatically set to 1 when
                           --target is newest or greatest, or when the
                           current version is a prerelease. (default: 0)
--prefix <path>            Current working directory of npm.
-r, --registry <uri>       Third-party npm registry. Run "ncu --help
                           --registry" for details.
-x, --reject <p>           Exclude packages matching the given string,
                           wildcard, glob, comma-or-space-delimited list,
                           /regex/, or predicate function.
--rejectVersion <p>        Exclude package.json versions using
                           comma-or-space-delimited list, /regex/, or
                           predicate function.
--removeRange              Remove version ranges from the final package
--retry <n>                Number of times to retry failed requests for
                           package info. (default: 3)
--root                     Runs updates on the root project in addition to
                           specified workspaces. Only allowed with
                           --workspace or --workspaces. (default: false)
-s, --silent               Don't output anything. Alias for --loglevel
--stdin                    Read package.json from stdin.
-t, --target <value>       Determines the version to upgrade to: latest,
                           newest, greatest, minor, patch, @[tag], or
                           [function]. (default: latest) Run "ncu --help
                           --target" for details.
--timeout <ms>             Global timeout in milliseconds. (default: no
                           global timeout and 30 seconds per
-u, --upgrade              Overwrite package file with upgraded versions
                           instead of just outputting to console.
--verbose                  Log additional information for debugging. Alias
                           for --loglevel verbose.
-w, --workspace <s>        Run on one or more specified workspaces. Add
                           --root to also upgrade the root project. (default:
-ws, --workspaces          Run on all workspaces. Add --root to also upgrade
                           the root project.
-V, --version              output the version number
-h, --help                 display help for command

Advanced Options

Some options have advanced usage, or allow per-package values by specifying a function in your ncurc.js file.

Run ncu --help [OPTION] to view advanced help for a specific option, or see below:



ncu --doctor
ncu -d

Iteratively installs upgrades and runs tests to identify breaking upgrades. Reverts broken upgrades and updates package.json with working upgrades.

Add "-u" to execute (modifies your package file, lock file, and node_modules)

To be more precise:

  1. Runs "npm install" and "npm test" to ensure tests are currently passing.
  2. Runs "ncu -u" to optimistically upgrade all dependencies.
  3. If tests pass, hurray!
  4. If tests fail, restores package file and lock file.
  5. For each dependency, install upgrade and run tests.
  6. Prints broken upgrades with test error.
  7. Saves working upgrades to package.json.

Additional options:

--doctorInstall   specify a custom install script (default: "npm install" or "yarn")
--doctorTest      specify a custom test script (default: "npm test")


$ ncu --doctor -u
Running tests before upgrading
npm install
npm run test
Upgrading all dependencies and re-running tests
ncu -u
npm install
npm run test
Tests failed
Identifying broken dependencies
npm install
npm install --no-save react@16.0.0
npm run test
  ✓ react 15.0.0 → 16.0.0
npm install --no-save react-redux@7.0.0
npm run test
  ✗ react-redux 6.0.0 → 7.0.0

  throw new Error('Test failed!')

npm install --no-save react-dnd@11.1.3
npm run test
  ✓ react-dnd 10.0.0 → 11.1.3
Saving partially upgraded package.json



ncu --format [value]

Modify the output formatting or show additional information. Specify one or more comma-delimited values.

│        group │ Groups packages by major, minor, patch, and major version zero updates.                    │
│ ownerChanged │ Shows if the package owner has changed.                                                    │
│         repo │ Infers and displays links to the package's source code repository. Requires packages to be │
│              │ installed.                                                                                 │
│         time │ Shows the publish time of each upgrade.                                                    │
│        lines │ Prints name@version on separate lines. Useful for piping to npm install.                   │



ncu --groupFunction [fn]

Customize how packages are divided into groups when using '--format group'. Only available in .ncurc.js or when importing npm-check-updates as a module:

  @param name             The name of the dependency.
  @param defaultGroup     The predefined group name which will be used by default.
  @param currentSpec      The current version range in your package.json.
  @param upgradedSpec     The upgraded version range that will be written to your package.json.
  @param upgradedVersion  The upgraded version number returned by the registry.
  @returns                A predefined group name ('major' | 'minor' | 'patch' | 'majorVersionZero' | 'none') or a custom string to create your own group.
groupFunction: (name, defaultGroup, currentSpec, upgradedSpec, upgradedVersion} {
  if (name === 'typescript' && defaultGroup === 'minor') {
    return 'major'
  if (name.startsWith('@myorg/')) {
    return 'My Org'
  return defaultGroup



ncu --packageManager [s]
ncu -p [s]

Specifies the package manager to use when looking up version numbers.

│            npm │ System-installed npm. Default.                                                            │
│           yarn │ System-installed yarn. Automatically used if yarn.lock is present.                        │
│           pnpm │ System-installed pnpm. Automatically used if pnpm-lock.yaml is present.                   │
│ staticRegistry │ Checks versions from a static file. Must include the --registry option with the path to a │
│                │ JSON registry file.                                                                       │
│                │                                                                                           │
│                │ Example:                                                                                  │
│                │                                                                                           │
│                │     $ ncu --packageManager staticRegistry --registry ./my-registry.json                   │
│                │                                                                                           │
│                │ my-registry.json:                                                                         │
│                │                                                                                           │
│                │     {                                                                                     │
│                │       "prettier": "2.7.1",                                                                │
│                │       "typescript": "4.7.4"                                                               │
│                │     }                                                                                     │



ncu --peer

Check peer dependencies of installed packages and filter updates to compatible versions.


The following example demonstrates how --peer works, and how it uses peer dependencies from upgraded modules.

The package ncu-test-peer-update has two versions published:

  • 1.0.0 has peer dependency "ncu-test-return-version": "1.0.x"
  • 1.1.0 has peer dependency "ncu-test-return-version": "1.1.x"

Our test app has the following dependencies:

"ncu-test-peer-update": "1.0.0",
"ncu-test-return-version": "1.0.0"

The latest versions of these packages are:

"ncu-test-peer-update": "1.1.0",
"ncu-test-return-version": "2.0.0"

With --peer:

ncu upgrades packages to the highest version that still adheres to the peer dependency constraints:

ncu-test-peer-update     1.0.0  →  1.1.0
ncu-test-return-version  1.0.0  →  1.1.0

Without --peer:

As a comparison: without using the --peer option, ncu will suggest the latest versions, ignoring peer dependencies:

ncu-test-peer-update     1.0.0  →  1.1.0
ncu-test-return-version  1.0.0  →  2.0.0



ncu --registry [uri]
ncu -r [uri]

Specify the registry to use when looking up package version numbers.

When --packageManager staticRegistry is set, --registry must specify a path to a JSON registry file.



ncu --target [value]
ncu -t [value]

Determines the version to upgrade to. (default: "latest")

│ greatest │ Upgrade to the highest version number published, regardless of release date or tag. Includes │
│   latest │ Upgrade to whatever the package's "latest" git tag points to. Excludes pre is specified.     │
│    minor │ Upgrade to the highest minor version without bumping the major version.                      │
│   newest │ Upgrade to the version with the most recent publish date, even if there are other version    │
│          │ numbers that are higher. Includes prereleases.                                               │
│    patch │ Upgrade to the highest patch version without bumping the minor or major versions.            │
│   @[tag] │ Upgrade to the version published to a specific tag, e.g. 'next' or 'beta'.                   │

You can also specify a custom function in your .ncurc.js file, or when importing npm-check-updates as a module:

/** Custom target.
  @param dependencyName The name of the dependency.
  @param parsedVersion A parsed Semver object from semver-utils.
  @returns One of the valid target values (specified in the table above).
target: (dependencyName, [{ semver, version, operator, major, minor, patch, release, build }]) => {
  if (major === '0') return 'minor'
  return 'latest'

Interactive Mode

Choose which packages to update in interactive mode:

ncu --interactive
ncu -i

ncu --interactive

Combine with --format group for a truly luxe experience:

ncu --interactive --format group

Config File

Use a .ncurc.{json,yml,js,cjs} file to specify configuration information. You can specify the file name and path using --configFileName and --configFilePath command line options.

For example, .ncurc.json:

  "upgrade": true,
  "filter": "svelte",
  "reject": ["@types/estree", "ts-node"]

Module/Programmatic Usage

npm-check-updates can be imported as a module:

import ncu from 'npm-check-updates'

const upgraded = await{
  // Pass any cli option
  packageFile: '../package.json',
  upgrade: true,
  // Defaults:
  // jsonUpgraded: true,
  // silent: true,

console.log(upgraded) // { "mypackage": "^2.0.0", ... }


Contributions are happily accepted. I respond to all PR's and can offer guidance on where to make changes. For contributing tips see


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