Since using the latest tag for phusion/baseimage is not recommended (see: https://github.com/phusion/baseimage-docker/issues/467) tag 0.11 is set explicitly. As a consequence, the image is now based on Ubuntu 18.04 LTS which comes along with Python 3.6 as default.
Features and Changes:
latesttag forphusion/baseimageis not recommended (see: https://github.com/phusion/baseimage-docker/issues/467) tag 0.11 is set explicitly. As a consequence, the image is now based on Ubuntu 18.04 LTS which comes along with Python 3.6 as default.