brew update – Error: /usr/local must be writable!

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[UPDATE – View updated solution at the bottom of the post.]

So, you wanted to update homebrew with the command

brew update

but received a similar error below:

Error: /usr/local must be writable!

Simple fix is to run

sudo chown -R $(whoami) /usr/local

Your problem should now be fixed. If not, you might have ran into this issue that i’ve come across, too:

Error: update-report should not be called directly!

I fixed this by running both these commands

brew upgrade


brew update

Ta da! No more errors! Hopefully.

Happy brewing. Cheers, y’all.

UPDATE (2018.03.27):

A commenter pointed out an issue they were having, and after i did some digging, it seems that if you’re running the latest Mac OS High Sierra, you can no longer do the commands i wrote about above. You’ll have to use the tweaked command below:

sudo chown -R $(whoami) $(brew --prefix)/*

I found the updated solution here. Thank you to ilovezfs.

There are some other comments below it that may apply to your development environment. Hope this helps!
Cheers and peace.

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6 years ago

Thanks a bunch, macariojames! This helped me out perfectly. :]

6 years ago

hi! while trying to fix this error i’m getting this other error: chown: /usr/local: Operation not permitted . Any other things I can try?

4 years ago

It’s still not working on Mojave. I have tried everything. And yes I have tried sudo chown -R $(whoami) $(brew –prefix)/* nothing is working I still can’t make local writable and i cant update brew ……

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