Operation not permitted - /usr/bin/update_rubygems

Question

When I execute on osx El Capitan:

sudo gem update --system  

I got the error:

Updating rubygems-update
ERROR:  While execut         


        

Answer 1

Starting with El Capitan, Apple prevents user applications to modify /usr/bin for security reasons. So just install/update rubygems in the recommended folder, /usr/local/bin:

sudo gem update -n /usr/local/bin --system