# npm-update

Update a package

## SYNOPSIS

    npm update [-g] [<name> [<name> ...]]

## DESCRIPTION

This command will update all the packages listed to the latest version (specified by the `tag` config), respecting semver.

It will also install missing packages. As with all commands that install packages, the `--dev` flag will cause `devDependencies` to be processed as well.

If the `-g` flag is specified, this command will update globally installed packages.

If no package name is specified, all packages in the specified location (global or local) will be updated.

As of `npm@2.6.1`, the `npm update` will only inspect top-level packages. Prior versions of `npm` would also recursively inspect all dependencies. To get the old behavior, use `npm --depth 9999 update`, but be warned that simultaneous asynchronous update of all packages, including `npm` itself and packages that `npm` depends on, often causes problems up to and including the uninstallation of `npm` itself.

To restore a missing `npm`, use the command:

    curl -L https://npmjs.com/install.sh | sh

## EXAMPLES

IMPORTANT VERSION NOTE: these examples assume `npm@2.6.1` or later. For older versions of `npm`, you must specify `--depth 0` to get the behavior described below.

For the examples below, assume that the current package is `app` and it depends on dependencies, `dep1` (`dep2`, .. etc.). The published versions of `dep1` are:

    {
      dist-tags: { latest: "1.2.2" },
      versions: { "1.2.2",
                  "1.2.1",
                  "1.2.0",
                  "1.1.2",
                  "1.1.1",
                  "1.0.0",
                  "0.4.1",
                  "0.4.0",
                  "0.2.0"
      }
    }

### Caret Dependencies

If `app`'s `package.json` contains:

    dependencies: {
      dep1: "^1.1.1"
    }

Then `npm update` will install `dep1@1.2.2`, because `1.2.2` is `latest` and `1.2.2` satisfies `^1.1.1`.

### Tilde Dependencies

However, if `app`'s `package.json` contains:

    dependencies: {
      dep1: "~1.1.1"
    }

In this case, running `npm update` will install `dep1@1.1.2`. Even though the `latest` tag points to `1.2.2`, this version does not satisfy `~1.1.1`, which is equivalent to `>=1.1.1 <1.2.0`. So the highest-sorting version that satisfies `~1.1.1` is used, which is `1.1.2`.

### Caret Dependencies below 1.0.0

Suppose `app` has a caret dependency on a version below `1.0.0`, for example:

    dependencies: {
      dep1: "^0.2.0"
    }

`npm update` will install `dep1@0.2.0`, because there are no other versions which satisfy `^0.2.0`.

If the dependence were on `^0.4.0`:

    dependencies: {
      dep1: "^0.4.0"
    }

Then `npm update` will install `dep1@0.4.1`, because that is the highest-sorting version that satisfies `^0.4.0` (`>= 0.4.0 <0.5.0`)

### Recording Updates with `--save`

When you want to update a package and save the new version as the minimum required dependency in `package.json`, you can use `npm update --save`. For example if `package.json` contains

    dependencies: {
      dep1: "^1.1.1"
    }

Then `npm update --save` will install `dep1@1.2.2` (i.e., `latest`), and `package.json` will be modified:

    dependencies: {
      dep1: "^1.2.2"
    }

Note that `npm` will only write an updated version to `package.json` if it installs a new package.

### Updating Globally-Installed Packages

`npm update -g` will apply the `update` action to each globally- installed package that is `outdated` -- that is, has a version that is different from `latest`.

NOTE: If a package has been upgraded to a version newer than `latest`, it will be downgraded.

## SEE ALSO

- npm-install(1)
- npm-outdated(1)
- npm-shrinkwrap(1)
- npm-registry(7)
- npm-folders(5)
- npm-ls(1)