mprovements in our knowledge of fundamental interactions are expected in the next years from the upgrade of existing accelerators or new machines under design. The full exploitation of the physics potential of these machines will require new and more performant detectors. The next
decade will be characterised by the high-luminosity LHC upgrade. New solutions in particular for the tracking system and the forward detector are beng proposed. A major upgrade will be on the trigger system aiming to exploit the maximum granularity and tracking information already at the first level. But other projects are also emerging, as challenging examples are the concept of an extreme flavour physics experiment and the fine granularity and high resolution detectors for future lepton colliders.