heroku toolbeltのインストールし、アカウント認証しようと

   heroku login

と入力したところ

heroku-cli: Adding dependencies...
 ▸    Get https://cli-assets.heroku.com/node/v5.4.1/node-v5.4.1-darwin-x64.tar.gz: dial tcp: lookup cli-assets.heroku.com on [2404:1a8:7f01:b::3]:53: no such host
 done
heroku-cli: Installing core plugins...
 ▸    

 ▸    fork/exec bin/node: no such file or directory
heroku-cli: Installing core plugins (retrying)...
 ▸    Error installing package. 
 ▸    
 ▸    Try running again with GODE_DEBUG=info to see more output.
heroku-cli: Adding dependencies...
 ▸    Get https://cli-assets.heroku.com/node/v5.4.1/node-v5.4.1-darwin-x64.tar.gz: dial tcp: lookup cli-assets.heroku.com on [2404:1a8:7f01:b::3]:53: no such host
 done
heroku-cli: Installing core plugins...
 ▸    

 ▸    fork/exec bin/node: no such file or directory
heroku-cli: Installing core plugins (retrying)...
 ▸    Error installing package. 
 ▸    
 ▸    Try running again with GODE_DEBUG=info to see more output.
 !    error getting commands pid 7504 exit 1

と表示されました。

 ▸    fork/exec bin/node: no such file or directory

このあたりが悪いのだろうと思うのですが、どう対応すれば良いのかわかりません。
対処方法をご存知でしたら、お教えいただけますでしょうか。