During June 2025, Chris Loomis focused on maintaining and improving the stability of the Subaru-PFS/datamodel repository by addressing compatibility issues with NumPy 2.x. He implemented a targeted bug fix in Python, replacing deprecated np.NaN with np.nan within the PfsConfig module to ensure correct nanmean calculations and prevent potential runtime errors during library upgrades. Drawing on his skills in data modeling and NumPy, Chris prioritized future-proofing the codebase over new feature development. His work contributed to the resilience of the repository, reducing upgrade risks for downstream users and maintaining reliable data processing workflows as dependencies evolve.