def update_check(force=False):
    """
    Makes a request to ctfd.io to check if there is a new version of CTFd available. The service is provided in return
    for users opting in to anonymous usage data collection. Users can opt-out of update checks by specifying
    UPDATE_CHECK = False in config.py

    :param force:
    :return:
    """
    # If UPDATE_CHECK is disabled don't check for updates at all.
    if app.config.get("UPDATE_CHECK") is False:
        return

    # Don't do an update check if not setup
    if is_setup() is False:
        return

    # Get when we should check for updates next.
    next_update_check = get_config("next_update_check") or 0

    # If we have passed our saved time or we are forcing we should check.
    update = (next_update_check < time.time()) or force

    if update:
        try:
            name = str(get_config("ctf_name")) or ""
            params = {
                "ctf_id": sha256(name),
                "current": app.VERSION,
                "python_version_raw": sys.hexversion,
                "python_version": python_version(),
                "db_driver": db.session.bind.dialect.name,
                "challenge_count": Challenges.query.count(),
                "user_mode": get_config("user_mode"),
                "user_count": Users.query.count(),
                "team_count": Teams.query.count(),
                "theme": get_config("ctf_theme"),
                "upload_provider": get_app_config("UPLOAD_PROVIDER"),
                "channel": app.CHANNEL,
            }
            check = requests.get(
                "https://versioning.ctfd.io/check", params=params, timeout=3
            ).json()
        except requests.exceptions.RequestException:
            pass
        except ValueError:
            pass
        else:
            try:
                latest = check["resource"]["tag"]
                html_url = check["resource"]["html_url"]
                if StrictVersion(latest) > StrictVersion(app.VERSION):
                    set_config("version_latest", html_url)
                elif StrictVersion(latest) <= StrictVersion(app.VERSION):
                    set_config("version_latest", None)
                next_update_check_time = check["resource"].get(
                    "next", int(time.time() + 43200)
                )
                set_config("next_update_check", next_update_check_time)
            except KeyError:
                set_config("version_latest", None)

    Makes a request to ctfd.io to check if there is a new version of CTFd available. The service is provided in return
    for users opting in to anonymous usage data collection. Users can opt-out of update checks by specifying
    UPDATE_CHECK = False in config.py

    :param force:
    :return:
    
CTFd/utils/updates/__init__.py