Device_class:windspeed views km/h instead of m/s

hi, where do i change preferd unit of mesaurement? im using the viva integration (GitHub - astrandb/viva: A modern Home Assistant integration for ViVa weather service from Swedish Sjöfartsverket) and what i can see in the it looks like its preferd m/s but somehow home assistant choose to convert it to km/h due to the device_class windspeed.
in the documentation for deviceclass its possible to change unit of mesauremnt but i guess that change the ending from km/h to m/s not the value. no one in metric countries use km/h for windspeed. m/s is more correct imo