VagrantへHerokuインストール時にエラー

linux
1[vagrant@vagrant-centos64 ~]$ sudo wget -O- https://toolbelt.heroku.com/install.sh | sh
2--2015-12-23 10:31:05--  https://toolbelt.heroku.com/install.sh
3Resolving toolbelt.heroku.com... 54.235.222.159, 54.235.97.119, 54.225.72.13
4Connecting to toolbelt.heroku.com|54.235.222.159|:443... connected.
5HTTP request sent, awaiting response... 200 OK
6Length: 975 [text/plain]
7Saving to: `STDOUT'
8
9100%[======================================>] 975         --.-K/s   in 0s      
10
112015-12-23 10:31:06 (133 MB/s) - written to stdout [975/975]
12
13This script requires superuser access to install software.
14You will be prompted for your password by sudo.
15Installation complete

linux
1[vagrant@vagrant-centos64 ~]$ echo 'PATH="/usr/local/heroku/bin:$PATH"' >> ~/.zshrc
2[vagrant@vagrant-centos64 ~]$ source ~/.zshrc
3[vagrant@vagrant-centos64 ~]$ heroku version
4/usr/local/heroku/lib/heroku/helpers.rb:35:in `home_directory': undefined method `home' for Dir:Class (NoMethodError)
5	from /usr/local/heroku/lib/heroku/updater.rb:22:in `updated_client_path'
6	from /usr/local/heroku/lib/heroku/updater.rb:176:in `inject_libpath'
7	from /usr/local/heroku/bin/heroku:19

インストールを終え、バージョンを確認する所でエラーが出てしまいます。
ご存知でしたらアドバイスいただけませんか。
よろしくお願いします。