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Dependencies – Cargo.lock
Here is a great quote from the cargo FAQ (https://doc.rust-lang.org/cargo/faq.html) about what the purpose of this file is and what it does:
The purpose of a Cargo.lock is to describe the state of the world at the time of a successful build. It is then used to provide deterministic builds across whatever machine is building the project by ensuring that the exact same dependencies are being compiled.
This serialized state can easily be transferred across teams or computers. Therefore, should a dependency introduce a bug with a patch update, your build should be largely unaffected unless you run cargo update. In fact, it's recommended for libraries to commit the Cargo.lock file to version control to retain a stable, working build. For debugging purposes, it's also quite handy to streamline the dependency tree.