I upgraded my Discord.js v12 to v13 but it send to me this error

/home/discord/project/bloodmoon/node_modules/discord.js/src/rest/APIRequest.js:33
    agent ??= new https.Agent({ ...this.client.options.http.agent, keepAlive: true });
          ^^^

SyntaxError: Unexpected token '??='

My node.js version is 16.7.0

node -v
v16.7.0

I think it's node.js problem it i can't find problem in that. what's the problem?