Civilized countries don’t allow retroactively increasing the penalty for breaking a law. Does Germany allow that?

The penalty doesn't have to be increased, it just needs to be selectively enforced.

	▲	seba_dos1 2 days ago \| parent \| next [-]
		You'd need to have some unenforced penalty first though.
	▲	victorbjorklund 2 days ago \| parent \| prev [-]
		There is no penalty.

gmueckl 2 days ago | parent | prev [-]

No, Germany punishes according to the laws at the time of the crime. It is not possible to retroactively enforce new criminal statutes.