Today’s entirely foreseeable headache in the offing: https://github.com/pandas-dev/pandas/issues/37654#issuecomment-845063168
I’m fairly sure that forthcoming changes to dateutil will break any pandas code using dateutil zones relatively soon.
Even if it gets fixed in pandas today I’m sure it will be annoying.
Not that there’s much action you can take as an end user of pandas other than getting your deployment pipeline in good enough shape that you can deploy the latest version of pandas on short notice.