Xkyer Yes, in your composer.json, make sure the new extension is listed in this section:
"require": {
"flarum/core": "^0.1.0",
"flarum/approval": "^0.1.0",
"flarum/bbcode": "^0.1.0",
"flarum/emoji": "^0.1.0",
"flarum/lang-english": "^0.1.0",
"flarum/flags": "^0.1.0",
"flarum/likes": "^0.1.0",
"flarum/lock": "^0.1.0",
"flarum/markdown": "^0.1.0",
"flarum/mentions": "^0.1.0",
"flarum/nicknames": "^0.1.0",
"flarum/pusher": "^0.1.0",
"flarum/statistics": "^0.1.0",
"flarum/sticky": "^0.1.0",
"flarum/subscriptions": "^0.1.0",
"flarum/suspend": "^0.1.0",
"flarum/tags": "^0.1.0"
},