The CLJS compiler seems to have changed the options it expects, so what's in the project.clj is offending it.
Upgrading is useful so that the tests can properly test edn/keyword roundtrips, which currently cannot be done because old cljs versions can't (cljs.reader/read-string ":/").
Have to figure out how to make the node-dev and node-adv tests work, primarily.
Update the test instructions in the README if appropriate
Remove the reader conditionals related to :/ in test.cljc.
I've attached patch with an update to ClojureScript and lein-cljsbuild. The reader conditionals have been removed and tests pass in both node-dev and node-adv.
Applied on master, thanks