Yes. Bootstrap releases Bootstrap version 3.4.0 with new classes and some fixes -

• New: Added a .row-no-gutters class, added docs searching via Algolia.
• Fixed: Resolved an XSS issue in Alert, Carousel, Collapse, Dropdown, Modal, and Tab components. See https://snyk.io/vuln/npm:bootstrap:20160627 for more details.
• Fixed: Added padding to .navbar-fixed-* on modal open , removed the double border on abbr elements.

How to upgrade your exisiting Bootstrap website - 

To upgrade your Bootstrap 3 projects to v3.4.0 

NPM - npm i bootstrap@previous or npm i bootstrap@3.4.0.