There is no way to do that other than manually updating page by page.
https://getbootstrap.com/docs/5.0/migration/
I would however try to convince the customer that you should move to tailwind instead, it will give more freedom in the design.
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I have a developed a laravel application and installed , now its live , now the client wants to change the UI from bootstrap 3.3 to Bootstrap 5.0 and change the look and feel all the pages . How can i do it with or without any tools . Please any experts advice will save my timings . thanks- Martin
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