Sorry, forgot to change the initial subject line to [PATCH core-updates]. Happy to follow on to bump further; the latest release is 1.62.1: https://github.com/rust-lang/rust/releases 1.60 was the minimum I needed for my own project and since this is my first try contributing to guix I figured I'd try getting that in before bumping further. Each bump takes a while since I need to build one minor version at a time.