A libdatetime-timezone-perl regression update has been released for Debian GNU/Linux 9 LTS.

DLA 2452-2: libdatetime-timezone-perl regression update

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Debian LTS Advisory DLA-2452-2 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Adrian Bunk
November 17, 2020   https://wiki.debian.org/LTS
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Package : libdatetime-timezone-perl
Version : 2.09-1+2020d+1
Debian Bug : 974899

2.09-1+2020d accidentally did omit changes to some files,
resulting in warnings.

For Debian 9 stretch, this problem has been fixed in version
2.09-1+2020d+1.

We recommend that you upgrade your libdatetime-timezone-perl packages.

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