What Changed in Rust Edition 2024?

Rust Edition 2024 is the latest stable edition that bundles recent language features, updated standard library defaults, and improved tooling into a single, consistent baseline for new projects. To use it, set the edition in your project's Cargo.toml file:

[package]
edition = "2024"

If you are updating the Rust Book repository specifically, run ./tools/update-editions.sh to update all listing Cargo.toml files, then manually set edition = "2024" in the [rust] table of both book.toml and nostarch/book.toml.

Rust Edition 2024 is like a new version of the rulebook for writing Rust code, released every few years to include improvements and new features. Switching to it ensures your project uses the latest best practices and syntax without breaking existing code. Think of it as upgrading your car's software to get the latest safety features while keeping the same engine.