I've got both IPython and IPython3 installed. I recently upgraded IPython to version 5.3.0 using pip. However, I can't figure out how to upgrade IPython3. It's currently at version 2.4.1.
pip3 to do it:
sudo apt install python3-pip pip3 install --upgrade pip --user pip3 install --upgrade ipython --user
Available versions are: 5.4.1, 6.1.0