All you need to do is modify your API call to specify V5, its a little bit different depending how you are doing your call - if you just submit a URL as part of your request, adding &api_version=5 into your call is sufficient (which you can see in my example link above). No other action is needed.
cURL would be like the below, notice the 'v5':
curl -H 'Client-ID: xxxxxxxxxxxxxxxx' \ -H 'Accept: application/vnd.twitchtv.v5+json' \