In case anyone else runs into this, I was getting this error trying to update from 1.19: $ rustup update stable info: syncing channel updates for 'stab

In case anyone else runs into this, I was getting this error trying to update from 1.19: $ rustup update stable info: syncing channel updates for 'stable-x86_64-apple-darwin' error: missing key: 'url' After I updated rustup from 1.0.0 to 1.6.0 with rustup self update, it worked.