cargo update - The Cargo Book

# cargo update

## NAME

cargo-update - Update dependencies as recorded in the local lock file

## SYNOPSIS

`cargo update [OPTIONS]`

## DESCRIPTION

This command will update dependencies in the `Cargo.lock` file to the latest version. It requires that the `Cargo.lock` file already exists as generated by commands such as cargo-build(1) or cargo-generate-lockfile(1).

## OPTIONS

### Update Options

-p SPEC…​
--package SPEC…​

  Update only the specified packages. This flag may be specified multiple times. See cargo-pkgid(1) for the SPEC format.

  If packages are specified with the `-p` flag, then a conservative update of the lockfile will be performed. This means that only the dependency specified by SPEC will be updated. Its transitive dependencies will be updated only if SPEC cannot be updated without updating dependencies. All other dependencies will remain locked at their currently recorded versions.

  If `-p` is not specified, all dependencies are updated.

--aggressive

  When used with `-p`, dependencies of SPEC are forced to update as well. Cannot be used with `--precise`.

--precise PRECISE

  When used with `-p`, allows you to specify a specific version number to set the package to. If the package comes from a git repository, this can be a git revision (such as a SHA hash or tag).

--dry-run

  Displays what would be updated, but doesn’t actually write the lockfile.

### Display Options

-v
--verbose

  Use verbose output. May be specified twice for "very verbose" output which includes extra output such as dependency warnings and build script output. May also be specified with the `term.verbose` config value.

-q
--quiet

  No output printed to stdout.

--color WHEN

  Control when colored output is used. Valid values:

  - `auto` (default): Automatically detect if color support is available on the terminal.

  - `always`: Always display colors.

  - `never`: Never display colors.

  May also be specified with the `term.color` config value.

### Manifest Options

--manifest-path PATH

  Path to the `Cargo.toml` file. By default, Cargo searches for the `Cargo.toml` file in the current directory or any parent directory.

--frozen
--locked

  Either of these flags requires that the `Cargo.lock` file is up-to-date. If the lock file is missing, or it needs to be updated, Cargo will exit with an error. The `--frozen` flag also prevents Cargo from attempting to access the network to determine if it is out-of-date.

  These may be used in environments where you want to assert that the `Cargo.lock` file is up-to-date (such as a CI build) or want to avoid network access.

--offline

  Prevents Cargo from accessing the network for any reason. Without this flag, Cargo will stop with an error if it needs to access the network and the network is not available. With this flag, Cargo will attempt to proceed without the network if possible.

  Beware that this may result in different dependency resolution than online mode. Cargo will restrict itself to crates that are downloaded locally, even if there might be a newer version as indicated in the local copy of the index. See the cargo-fetch(1) command to download dependencies before going offline.

  May also be specified with the `net.offline` config value.

### Common Options

+TOOLCHAIN

  If Cargo has been installed with rustup, and the first argument to `cargo` begins with `+`, it will be interpreted as a rustup toolchain name (such as `+stable` or `+nightly`). See the rustup documentation for more information about how toolchain overrides work.

-h
--help

  Prints help information.

-Z FLAG…​

  Unstable (nightly-only) flags to Cargo. Run `cargo -Z help` for details.

## ENVIRONMENT

See the reference for details on environment variables that Cargo reads.

## Exit Status

0

  Cargo succeeded.

101

  Cargo failed to complete.

## EXAMPLES

1. Update all dependencies in the lockfile:

       cargo update

2. Update only specific dependencies:

       cargo update -p foo -p bar

3. Set a specific dependency to a specific version:

       cargo update -p foo --precise 1.2.3

## SEE ALSO

cargo(1), cargo-generate-lockfile(1)