The Library Card platform is currently running on Django 1.11, which stopped receiving extended support in April 2020 (https://www.djangoproject.com/download/). We need to upgrade to a newer, supported, version of Django.
At the time of writing, Django 2.2 is the current long-term support version, running until April 2022, but now that we have more engineering capacity we can comfortably move to 3.0 and upgrade on an ongoing basis.