I just released a new version of jupyter_console 6.3.0,
Minor revisions mostly due to a rare code path that was calling a non existing method (self.write, instead of self.shell.write) – discovered via an issue in pyflyby. Also removed direct usage of nose in tests, which should not be a dependency anymore, cleanup some code.
If you are using jupyter_console, you can upgrade with
pip install jupyter_console --upgrade
It should soon be available on conda-forge.