A tzdata new timezone database has been released for Debian GNU/Linux 9 LTS.

DLA 3051-1: tzdata new timezone database

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Debian LTS Advisory DLA-3051-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
June 15, 2022   https://wiki.debian.org/LTS
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Package : tzdata
Version : 2021a-0+deb9u4
Debian Bug : 1012191

This update includes the latest changes to the leap second list,
including an update to its expiry date, which was set for the end of
June.

For Debian 9 stretch, this problem has been fixed in version
2021a-0+deb9u4.

We recommend that you upgrade your tzdata packages.

For the detailed security status of tzdata please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/tzdata

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS