Bootstrap Long-Term Support (LTS)

Bootstrap 3 and 4 have reached end-of-life (EOL), which means the open source community no longer supports them. However, migrating to Bootstrap 5 is more than a version bump — it’s a fundamental shift in how modern interfaces are built, and it often requires a full rewrite to do it right. 

Bootstrap 5 removes jQuery, restructures core components, updates the grid system, and introduces a new utility-first approach that affects layout, spacing, and responsiveness across every page. Many class names, behaviors, and accessibility patterns have changed, while forms, navbars, and JavaScript components were rebuilt to be lighter, faster, and more flexible. Custom themes and overrides built for earlier versions of Bootstrap don’t cleanly transfer, as variables, mixins, and the entire customization model were redesigned. 

To take full advantage of improved performance, cleaner code, and a more future-proof foundation, teams typically need to rework their markup and styling from the ground up — making a full rewrite the smartest, most strategic path forward. If you can’t upgrade to Bootstrap 5 yet, OpenLogic offers long-term support for Bootstrap 3 and 4 through the end of 2030.