Version 4.7.5 is primarily a bugfix release for a single issue with ncremap. Version 4.7.4 inadvertently introduced a bug that mainly affects regridding of ALM/CLM/CTSM/ELM land model data that contains "hidden" (unused) dimensions. The other new feature is that ncclimo automatically handles MPAS Seaice model output named with the new names (mpassi) and new date convention, yyyy-mm-01-00000. If these fixes/features do not affect you there may be no reason to upgrade, yet see below for other minor new features you may want.