A ruby security update has been released for Fedora 33.

SECURITY: Fedora 33 Update: ruby-2.7.3-136.fc33

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Fedora Update Notification
FEDORA-2021-6385a09efc
2021-04-17 14:06:11.337489
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Name : ruby
Product : Fedora 33
Version : 2.7.3
Release : 136.fc33
URL :   http://ruby-lang.org/
Summary : An interpreter of object-oriented scripting language
Description :
Ruby is the interpreted scripting language for quick and easy
object-oriented programming. It has many features to process text
files and to do system management tasks (as in Perl). It is simple,
straight-forward, and extensible.

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Update Information:

Upgrade to Ruby 2.7.3.
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ChangeLog:

* Wed Apr 7 2021 Pavel Valena - 2.7.3-136
- Upgrade to Ruby 2.7.3.
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References:

[ 1 ] Bug #1947526 - CVE-2021-28965 ruby: XML round-trip vulnerability in REXML
  https://bugzilla.redhat.com/show_bug.cgi?id=1947526
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2021-6385a09efc' at the command
line. For more information, refer to the dnf documentation available at
  http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

All packages are signed with the Fedora Project GPG key. More details on the
GPG keys used by the Fedora Project can be found at
  https://fedoraproject.org/keys