The latest version of jQuery is now 3.3.
The way to update depends on if your website is running off of a local copy or from a hosted CDN.
The official versions are available at
jQuery CDN[
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There may be a few "breaking changes" involved with the change; and there is a "jQuery Migrate" scripts which can help alleviate the transition.
If you go this route be aware that this is may only be a temporary fix, it is best to update whatever you have that is using jQuery so that bandages like this are not needed.
GitHub - jquery/jquery-migrate: APIs and features removed from jQuery core[
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