Downgrade a Cargo dependency by setting a specific older version number in Cargo.toml and running cargo update.
Downgrade a dependency by specifying the exact older version in your Cargo.toml file. Open Cargo.toml, locate the dependency under [dependencies], and change the version number to the desired older release.
[dependencies]
serde = "1.0.150"
Run cargo update -p serde to update the lockfile with the new version.
Downgrading a dependency in Cargo forces your project to use an older version of a library instead of the newest one. You do this when a recent update breaks your code or removes features you need. Think of it like switching back to a previous version of an app because the new update has bugs.