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 spec, 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 spec is not specified, all dependencies are updated.

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

When used with spec, 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).

While not recommended, you can specify a yanked version of a package. When possible, try other non-yanked SemVer-compatible versions or seek help from the maintainers of the package.

A compatible pre-release version can also be specified even when the version requirement in Cargo.toml doesn’t contain any pre-release identifier (nightly only).

Update spec to latest SemVer-breaking version.

Version requirements will be modified to allow this update.

This only applies to dependencies when

This option is unstable and available only on the nightly channel <https://doc.rust-lang.org/book/appendix-07-nightly-rust.html> and requires the -Z unstable-options flag to enable. See <https://github.com/rust-lang/cargo/issues/12425> for more information.

Attempt to update only packages defined in the workspace. Other packages are updated only if they don’t already exist in the lockfile. This option is useful for updating Cargo.lock after you’ve changed version numbers in Cargo.toml.

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

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 <https://doc.rust-lang.org/cargo/reference/config.html>.

Do not print cargo log messages. May also be specified with the term.quiet config value <https://doc.rust-lang.org/cargo/reference/config.html>.

Control when colored output is used. Valid values:

May also be specified with the term.color config value <https://doc.rust-lang.org/cargo/reference/config.html>.

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

Ignore rust-version specification in packages.

Asserts that the exact same dependencies and versions are used as when the existing Cargo.lock file was originally generated. Cargo will exit with an error when either of the following scenarios arises:

It may be used in environments where deterministic builds are desired, such as in CI pipelines.

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 <https://doc.rust-lang.org/cargo/reference/config.html>.

Equivalent to specifying both --locked and --offline.

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 <https://rust-lang.github.io/rustup/overrides.html> for more information about how toolchain overrides work.

Overrides a Cargo configuration value. The argument should be in TOML syntax of KEY=VALUE, or provided as a path to an extra configuration file. This flag may be specified multiple times. See the command-line overrides section <https://doc.rust-lang.org/cargo/reference/config.html#command-line-overrides> for more information.

Changes the current working directory before executing any specified operations. This affects things like where cargo looks by default for the project manifest (Cargo.toml), as well as the directories searched for discovering .cargo/config.toml, for example. This option must appear before the command name, for example cargo -C path/to/my-project build.

This option is only available on the nightly channel <https://doc.rust-lang.org/book/appendix-07-nightly-rust.html> and requires the -Z unstable-options flag to enable (see #10098 <https://github.com/rust-lang/cargo/issues/10098>).

Prints help information.

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