Version 1.4 of the Infrared Sounder Pre-processor (IRSPP) has been released. This version is compatible with the in-orbit MTG-IRS data, as well as the final set of pre-launch test data. The update release includes a new test case (in-orbit data from November 2025), an option to perform spatial averaging, refinements to the output BUFR sequence, python tools for displaying the netCDF and BUFR data, and updates to the build scripts. Further details at https://nwp-saf.eumetsat.int/site/software/irspp/