How can I use CakePHP on Heroku without getting logged out everytime I do an update?

Essentially, I host a CakePHP site on Heroku (http://theboxngo.com), but whenever I do a Git push to update the site, all my users get logged out.

I'm assuming it has to do with the /tmp folder which gets refreshed everytime you do an update on Heroku. How can I work around this issue?

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