This plugin will guarantee that when running the repl, you are always up to date.

Put [lein-autoreload "0.1.1"] into the :plugins vector of your :user profile.

When you start up the repl with lein repl and change any files, you'll notice output in the repl like:

:reloading (my-proj.core)

Copyright © 2013 Thomas Rampelberg

Distributed under the MIT license.