Add captcha to drupal webform

I have created a sign-up webform on the club’s website but we are under attack by a spam bot who is keep subscribing.
Is there away to add an anti-bot protection - captcha box?

Thank you in advance.

Ok I managed to install the math captcha and I will check if the problem is resolved.

Hi Vasili,

You can also enable the Honeypot module in order to prevent spam.

Once you enable it, configure it like in the image below, save and clear caches.

Kind regards,