A tzdata new upstream version has been released for Debian GNU/Linux 9 LTS.

DLA 2542-1: tzdata new upstream version

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Debian LTS Advisory DLA-2542-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
February 02, 2021   https://wiki.debian.org/LTS
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Package : tzdata
Version : 2021a-0+deb9u1

This update includes the changes in tzdata 2021a. Notable
changes are:

- South Sudan changed from +03 to +02 on 2021-02-01.

For Debian 9 stretch, this problem has been fixed in version
2021a-0+deb9u1.

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