zsh: permission denied: ~/.bash_profile

I am trying to run the following to set env, but I can not:

echo 'export ethereum_home=/Users/mattthomas/ethereum'>>~/.bash_profile

Permissions for .bash_profile:

-rw-r--r--    1 root    staff    447 Jun 17 21:50 .bash_profile

How can I write to .bash_profile?