feature edition2024 is required / Cargo.lock version too new Rust Origin: Application & API OSI layer 7 · Application Last updated 5 Nov 2026

Cargo: error: failed to parse manifest — feature `edition2024` is required / lock file version 4 requires `-Znext-lockfile-bump`

Your Cargo is older than the manifest or lockfile requires.

Exact message you may see error: failed to parse manifest at Cargo.tomlfeature `edition2024` is requiredlock file version 4 requires `-Znext-lockfile-bump`this version of Cargo is older than the `2024` editionerror: failed to parse lock file at Cargo.lock
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Seen on: Rust

Meaning

Update Rust (rustup update stable), or downgrade the offending crate/lock (cargo update -p crate --precise X) when you must stay on an old toolchain. Lockfile v4 needs Cargo 1.78+; edition = "2024" needs 1.85+. Pin the toolchain in rust-toolchain.toml for consistency across team/CI.

Common causes

  • Old Rust toolchain
  • Cargo.lock generated by newer Cargo
  • Dependency using edition = "2024"
  • CI image pinned to an old Rust
  • Different toolchains between dev and CI

⚡ Quick fix

  1. rustup update stable
  2. Add rust-toolchain.toml (channel = "stable")
  3. Pin crates to older versions with cargo update -p X --precise Y if you can't upgrade

Detailed fix by platform

Rust

  1. rustup update stable && cargo --version

How to diagnose

  1. Cargo — Version?
  2. Lock — Version?
  3. CI — Same toolchain?

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: Application & API. Errors that are often confused with or caused by this one (click to open):

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