Install cargo-mutants from source:

cargo install --locked cargo-mutants

You can also use cargo binstall from cargo-binstall, or install binaries from GitHub releases.

Supported Rust versions

Building cargo-mutants requires a reasonably recent stable (or nightly or beta) Rust toolchain. The supported version is visible in

After installing cargo-mutants, you should be able to use it to run tests under any toolchain, even toolchains that are far too old to build cargo-mutants, using the standard + option to cargo:

cargo +1.48 mutants