Hi,
    I'm using emacs 24 on OSX and I'm unable to upgrade org mode.

I did the following

1) Checkout the org mode git repo
2) Checkout the latest release tag : git checkout release_8.2.5h
3) Tell emacs to load the relevant paths
     ;; Setup org mode
     (add-to-list 'load-path "/Users/agh/arun/dev/org-mode/lisp" t)
     (add-to-list 'load-path "/Users/agh/arun/dev/org-mode/contrib/lisp" t)

     (require 'org)
     (define-key global-map "\C-cl" 'org-store-link)
     (define-key global-map "\C-ca" 'org-agenda)
     (setq org-log-done t)
     (setq org-agenda-files (list "~/Google Drive/orgmode/work.org"
                             "~/Google Drive/orgmode/personal.org"))
     (require 'ox-taskjuggler)
     ;; End Setup org mode

It looks like Emacs is loading the new libraries correctly
locate-library ox-taskjuggler returns the path to the git directory

However, emacs is still using the org mode files which came with the
distribution. Specifically when I run taskjuggler export, the old exporter
is being used.

locate-library org-taskjuggler returns a path in the emacs installation
files (an elc file).

How do I get emacs to use the latest org mode files from the git repo ?

Thanks,
Arunabha