Worked on the spack/spack-packages repository to deliver a targeted update for SingularityCE dependency and version management. Focused on stabilizing builds and improving reproducibility, the work involved updating the checksum for version 4.3.3, adding support for version 4.3.7, and removing a conflicting newer release to prevent dependency drift. Using Python and leveraging skills in dependency and package management, the changes enhanced CI reliability and ensured consistent, compliant container images. By explicitly pinning versions and validating checksums, the update reduced build failures and improved maintainability, aligning dependencies with current release lines to support stable deployment across diverse environments.