Customize Bootstrap 4's grid-system Breakpoints

I have an application where the design needs a 1280 breakpoint from desktop to tablet, or, xl to lg respectively. However, Bootstrap itself has the xl breakpoint at 1200.

I need to change that xl breakpoint globally for bootstrap. Do I have to recompile Bootstrap 4 from the source files?

I tried setting this in with my Sass build:

$grid-breakpoints: (
  // Extra small screen / phone
  xs: 0,
  // Small screen / phone
  sm: 576px,
  // Medium screen / tablet
  md: 768px,
  // Large screen / desktop
  lg: 992px,
  // Extra large screen / wide desktop
  xl: 1280px
);

$container-max-widths: (
  sm: 540px,
  md: 720px,
  lg: 960px,
  xl: 1220px
);

However, nothing changed with the breakpoint for xl globally, it still would do the break instead at 1200px wide.

Bootstrap 4.x & 5.x

You need to override the $grid-breakpoints and $container-max-widths variables BEFORE importing the Bootstrap sources. Here a working example (scss):

// File: theme.scss
// Override default BT variables:
$grid-breakpoints: (
        xs: 0,
        sm: 576px,
        md: 768px,
        lg: 992px,
        xl: 1200px,
        xxl: 1900px
);
    
$container-max-widths: (
        sm: 540px,
        md: 720px,
        lg: 960px,
        xl: 1140px,
        xxl: 1610px
);
    
// Import BT sources
@import "../node_modules/bootstrap/scss/bootstrap";

// Your CSS (SASS) rules here...