Track and review changes to the Bootstrap source files, documentation, and components to help you migrate from v4 to v5. Dependencies Dropped jQuery. Upgraded from Popper v1.x to Popper v2.x. Replaced Libsass with Dart Sass as our Sass compiler given Libsass was deprecated. Migrated from Jekyll to Hugo for building our documentation Browser support Dropped Internet Explorer 10 and 11 Dropped Micro