Recent improvements to pygfunction, an open-source tool for the calculation of ??-functions, are presented. The latest version 2.2 enables the calculation of ??-functions for fields containing inclined boreholes. Various changes introduced in versions 2.0, 2.1 and 2.2 have led to significant decreases in calculation time and memory usage while increasing the accuracy of calculations. This allows the calculation of ??-functions of fields comprised of thousands of boreholes. A development roadmap towards a version 3.0 is presented. This future release will increase the scope of the tool to consider additional physical processes.