Thanks for the report.
Pyobjc is in Enthought's PyPI mirror rather than in the main Canopy/EPD repository. You can see this from the PyPI logo in package manager, or from enpkg -s pyobc
at the command line. We are aware that our PyPI mirror is quite out of date; automating this is on our to-do list but will come after other more pressing improvements to our build and deployment system.
You should be able to install a newer version of pyobjc following these guidelines: Installing external packages into Canopy Python.