How to execute rake while installing

[paperchalice]

How to execute rake when install a formula or use brew irb, if use
system "rake" will output

Traceback (most recent call last):
	2: from /usr/bin/rake:23:in `<main>'
	1: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems.rb:302:in `activate_bin_path'
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems.rb:283:in `find_spec_for_exe': can't find gem rake (>= 0.a) with executable rake (Gem::GemNotFoundException)
=> false

macOS version: 11.2.2

[carlocab]

Might be related to Homebrew/brew#10695.

[Bo98]

This should be fixed now. Run brew update and try again.