boot show -u should show new releases (shows old)

[zentrope]

My dependencies in build.boot look like:

[org.clojure/clojurescript "0.0-2411" :scope "provided"]
[om "0.8.0-beta3" :scope "provided"]

According to the help on the boot show command:

  -u, --updates    Print newer releases of outdated dependencies.

However, when I run boot show -u, I get the following:

[org.clojure/clojurescript "0.0-2411" :scope "provided"]
[om "0.8.0-beta3" :scope "provided"]

In other words, I don't get the newer versions promised by the help text. (This used to work.)