I originally posted at

I ran into this error when I tried any brew operation (like brew update and brew upgrade) on a Mac. I had just upgraded to macOS Big Sur 11.1 and suddenly brew broke!

$ brew update

xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools),

missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun

The fix, luckily, is pretty straight forward. Install the Xcode toolkit! Even if you had it installed before, you might have to re-register it or update it to the latest version.

$ xcode-select — install

If that doesn’t work, force it to reset. You’ll need sudo access for this one.

$ sudo xcode-select — reset

If even that fails, go to the and download Xcode manually.


I am a computer engineer. Please visit my website for more details. I am here because I like to share my experiences in computer science and my coding life.

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store