A tzdata new timezone database has been released for Debian GNU/Linux 8 and 9 Extended LTS to update the tzdata database.

ELA-842-1 tzdata new timezone database

Package : tzdata
Version : 2021a-0+deb8u10 (jessie), 2021a-0+deb9u10 (stretch)

This update includes the changes in tzdata 2023c. Notable
changes are:

Revert Lebanon DST changes.
Updated leap second list.

  ELA-842-1 tzdata new timezone database