Unfortunately this is not a simple matter of pointing to new css/js files: each version of Bootstrap is a significant rewrite and they're not backwards-compatible. CSS classnames have changed, there was a switch to a flexbox/grid system, and responsive layout is handled differently(?). Shouldn't be a huge deal, but it's not just a simple thing.
Unfortunately this is not a simple matter of pointing to new css/js files: each version of Bootstrap is a significant rewrite and they're not backwards-compatible. CSS classnames have changed, there was a switch to a flexbox/grid system, and responsive layout is handled differently(?). Shouldn't be a huge deal, but it's not just a simple thing.