Version 4.8.1 primarily contains enhancements to the vertical interpolation feature of ncremap, ncclimo, and ncks. Two extrapolation options are now supported (nearest neighbor and missing value), and the entire procedure now works with the ECMWF IFS hybrid sigma pressure grid as input. Other changes include better support for north-to-south (n2s) Gaussian grid inferral and output, and ncclimo updates and improvements for finer-grained MPI parallelism.