Rust 1.98.1

Breaking: Rust 1.98.1 is here. Point release on top of 1.98.0, shipped September 3, 2026. One fix, and it matters. This patch has no new features.

What changed in this release:

• rustc miscompilation fix — Corrects a compiler bug in vtable generation that produced wrong code at runtime.
• Backported from 1.98.0 — Applies the fix to the stable line instead of waiting for the next minor release.

Who Should Update

Projects that rely on dynamic dispatch through trait objects are most exposed. If you hit flaky or undefined behavior in code using vtables, upgrade and rebuild.

How to Update

Update via the toolchain manager:

rustup update stable

Then check your version:

rustc --version

Expect rustc 1.98.1.

That is the whole release. Install, rebuild, move on.