A singularity security update has been released for Fedora 34.

SECURITY: Fedora 34 Update: singularity-3.7.3-1.fc34

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Fedora Update Notification
FEDORA-2021-e49f5e66f8
2021-04-24 20:00:51.078312
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Name : singularity
Product : Fedora 34
Version : 3.7.3
Release : 1.fc34
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 3.7.3
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ChangeLog:

* Wed Apr 7 2021 Dave Dykstra - 3.7.3-1
- Upgrade to upstream security release 3.7.3
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References:

[ 1 ] Bug #1946970 - singularity-3.7.3 is available
  https://bugzilla.redhat.com/show_bug.cgi?id=1946970
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2021-e49f5e66f8' 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