A singularity security update has been released for Fedora 33.

SECURITY: Fedora 33 Update: singularity-3.7.4-1.fc33

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Fedora Update Notification
FEDORA-2021-ac3ef133e8
2021-06-04 01:02:33.600109
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Name : singularity
Product : Fedora 33
Version : 3.7.4
Release : 1.fc33
URL :   https://www.sylabs.io/singularity/
Summary : Application and environment virtualization
Description :
Singularity provides functionality to make portable
containers that can be used across host environments.

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Update Information:

Upgrade to upstream security release 3.7.4
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ChangeLog:

* Wed May 26 2021 Dave Dykstra - 3.7.4-1
- Upgrade to upstream security release 3.7.4
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References:

[ 1 ] Bug #1965066 - singularity-3.7.4 is available
  https://bugzilla.redhat.com/show_bug.cgi?id=1965066
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2021-ac3ef133e8' 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