Hi Holger and Brad
Here is a little more extensive list of dependencies:
python-certbot (of course as it is the one providing certbot)
python3-acme (>= 0.26.0~) - not in jessie, available in backports
python3-configargparse - not in jessie, available in backports
python3-cryptography (>= 1.2) - update needed (affecting something else?), available in backports
python3-josepy - not in jessie
python3-rfc3339 - not in jessie, available in backports
python3-sphinx (>= 1.6) - update needed (affecting something else?)
python-certbot-nginx
python-certbot-apache
python-certbot-nginx and python-certbot-apache do not seem to add any additional dependencies that are not already in jessie.
I have not checked if any of the above packages require further dependencies so the list may grow larger.
Best regards
// Ola