We are happy to announce that iMOD 4.0 has just been released, including a brand new parallel solver, the Parallel Krylov Solver Package. This solver has been developed by Deltares, USGS and WEnR (Alterra) in collaboration with Utrecht University and Delft University of Technology. From now on you can run your iMOD model on a multi-core computer allowing drastic reduction in run times. The PKS package can be used both on multi-core personal desktop and laptop computers but also on powerful supercomputers. A new tutorial-section on how to use the PKS package has been added to the tutorial 'Model Simulation'; go check it out!