You may be aware that there is a cyber war going on involving hackers and developers. The hackers are always one step ahead and continually attempt, and succeed to hack websites built on the WordPress, Joomla or Drupal platforms to name a few.
You need to make sure your website is up to date with the latest version of these platforms and all plugins & Modules are patched. For WordPress you can easily do this in ADMIN, whose Dashboard will tell you what needs updating. If this appears a bit daunting then call your developers in to quote you on these works.
The last thing you want is a hacked website that your Host takes down for delivering malicious content. I also expect your customer may not like it either.