This release is a patch with many changes, including (but not limited to):

• unified linear solver interfaces in all SUNDIALS packages
• encapsulated nonlinear solvers in all SUNDIALS integrators
• reorganization of ARKode to allow for the development of new integration methods
• new ARKode stepper for two-rate explicit/explicit multirate infinitesimal step methods
• Fortran 2003 interfaces to CVODE and several SUNDIALS modules
• an OpenMP 4.5+ NVECTOR

Learn more:

• v4.0.2 release notes
• The complete SUNDIALS release history
• Downloads via the SUNDIALS website and GitHub repo