PyHEP.dev is an in-person, informal workshop for developers of Python software in HEP to plan a coherent roadmap and make priorities for the upcoming year. It complements the PyHEP Users online workshop, which is intended for both developers and physicists.Both PyHEP workshops are supported by the HEP Software Foundation (HSF). Further information is on the PyHEP Working Group website.You are encouraged to register to the HSF forum to receive further information concerning the organisati