diff --git a/README.md b/README.md
index 6795ebe..db34fa4 100644
--- a/README.md
+++ b/README.md
@@ -77,7 +77,7 @@ For simplicity, this project will use the same version numbers as Bootstrap.
 
 ## Changelog
 
-https://github.com/twbs/bootstrap/releases/tag/v5.3.0
+https://github.com/twbs/bootstrap/releases/tag/v5.3.1
 
 ## Copyright and license
 
diff --git a/_nav.scss b/_nav.scss
index aedbdba..ff073d3 100644
--- a/_nav.scss
+++ b/_nav.scss
@@ -44,7 +44,8 @@
   }
 
   // Disabled state lightens text
-  &.disabled {
+  &.disabled,
+  &:disabled {
     color: var(--#{$prefix}nav-link-disabled-color);
     pointer-events: none;
     cursor: default;
@@ -79,13 +80,6 @@
       isolation: isolate;
       border-color: var(--#{$prefix}nav-tabs-link-hover-border-color);
     }
-
-    &.disabled,
-    &:disabled {
-      color: var(--#{$prefix}nav-link-disabled-color);
-      background-color: transparent;
-      border-color: transparent;
-    }
   }
 
   .nav-link.active,
@@ -117,12 +111,6 @@
 
   .nav-link {
     @include border-radius(var(--#{$prefix}nav-pills-border-radius));
-
-    &:disabled {
-      color: var(--#{$prefix}nav-link-disabled-color);
-      background-color: transparent;
-      border-color: transparent;
-    }
   }
 
   .nav-link.active,
diff --git a/_reboot.scss b/_reboot.scss
index 4226ab8..81ea216 100644
--- a/_reboot.scss
+++ b/_reboot.scss
@@ -524,15 +524,15 @@ legend {
   height: auto;
 }
 
-// 1. Correct the outline style in Safari.
-// 2. This overrides the extra rounded corners on search inputs in iOS so that our
+// 1. This overrides the extra rounded corners on search inputs in iOS so that our
 //    `.form-control` class can properly style them. Note that this cannot simply
 //    be added to `.form-control` as it's not specific enough. For details, see
 //    https://github.com/twbs/bootstrap/issues/11586.
+// 2. Correct the outline style in Safari.
 
 [type="search"] {
-  outline-offset: -2px; // 1
-  -webkit-appearance: textfield; // 2
+  -webkit-appearance: textfield; // 1
+  outline-offset: -2px; // 2
 }
 
 // 1. A few input types should stay LTR
diff --git a/_variables-dark.scss b/_variables-dark.scss
index 494eefa..79f29a3 100644
--- a/_variables-dark.scss
+++ b/_variables-dark.scss
@@ -40,7 +40,7 @@ $light-border-subtle-dark:          $gray-700 !default;
 $dark-border-subtle-dark:           $gray-800 !default;
 // scss-docs-end theme-border-subtle-dark-variables
 
-$body-color-dark:                   $gray-500 !default;
+$body-color-dark:                   $gray-300 !default;
 $body-bg-dark:                      $gray-900 !default;
 $body-secondary-color-dark:         rgba($body-color-dark, .75) !default;
 $body-secondary-bg-dark:            $gray-800 !default;
diff --git a/_variables.scss b/_variables.scss
index 0288898..eb066c6 100644
--- a/_variables.scss
+++ b/_variables.scss
@@ -705,6 +705,10 @@ $hr-border-color:             null !default; // Allows for inherited colors
 $hr-border-width:             var(--#{$prefix}border-width) !default;
 $hr-opacity:                  .25 !default;
 
+// scss-docs-start vr-variables
+$vr-border-width:             var(--#{$prefix}border-width) !default;
+// scss-docs-end vr-variables
+
 $legend-margin-bottom:        .5rem !default;
 $legend-font-size:            1.5rem !default;
 $legend-font-weight:          null !default;
@@ -1216,7 +1220,8 @@ $navbar-dark-color:                 rgba($white, .55) !default;
 $navbar-dark-hover-color:           rgba($white, .75) !default;
 $navbar-dark-active-color:          $white !default;
 $navbar-dark-disabled-color:        rgba($white, .25) !default;
-$navbar-dark-toggler-icon-bg:       url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'><path stroke='#{$navbar-dark-color}' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/></svg>") !default;
+$navbar-dark-icon-color:            $navbar-dark-color !default;
+$navbar-dark-toggler-icon-bg:       url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'><path stroke='#{$navbar-dark-icon-color}' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/></svg>") !default;
 $navbar-dark-toggler-border-color:  rgba($white, .1) !default;
 $navbar-dark-brand-color:           $navbar-dark-active-color !default;
 $navbar-dark-brand-hover-color:     $navbar-dark-active-color !default;
@@ -1543,9 +1548,6 @@ $alert-margin-bottom:           1rem !default;
 $alert-border-radius:           var(--#{$prefix}border-radius) !default;
 $alert-link-font-weight:        $font-weight-bold !default;
 $alert-border-width:            var(--#{$prefix}border-width) !default;
-$alert-bg-scale:                -80% !default;
-$alert-border-scale:            -70% !default;
-$alert-color-scale:             40% !default;
 $alert-dismissible-padding-r:   $alert-padding-x * 3 !default; // 3x covers width of x plus default padding on either side
 // scss-docs-end alert-variables
 
diff --git a/forms/_floating-labels.scss b/forms/_floating-labels.scss
index 3ca4264..2cf0470 100644
--- a/forms/_floating-labels.scss
+++ b/forms/_floating-labels.scss
@@ -84,7 +84,8 @@
     }
   }
 
-  > :disabled ~ label {
+  > :disabled ~ label,
+  > .form-control:disabled ~ label { // Required for `.form-control`s because of specificity
     color: $form-floating-label-disabled-color;
 
     &::after {
diff --git a/forms/_form-check.scss b/forms/_form-check.scss
index 83aacba..f8d9b08 100644
--- a/forms/_form-check.scss
+++ b/forms/_form-check.scss
@@ -33,13 +33,13 @@
   height: $form-check-input-width;
   margin-top: ($line-height-base - $form-check-input-width) * .5; // line-height minus check height
   vertical-align: top;
+  appearance: none;
   background-color: var(--#{$prefix}form-check-bg);
   background-image: var(--#{$prefix}form-check-bg-image);
   background-repeat: no-repeat;
   background-position: center;
   background-size: contain;
   border: $form-check-input-border;
-  appearance: none;
   print-color-adjust: exact; // Keep themed appearance for print
   @include transition($form-check-transition);
 
diff --git a/forms/_form-control.scss b/forms/_form-control.scss
index ca2a7df..67ae5f4 100644
--- a/forms/_form-control.scss
+++ b/forms/_form-control.scss
@@ -11,10 +11,10 @@
   font-weight: $input-font-weight;
   line-height: $input-line-height;
   color: $input-color;
+  appearance: none; // Fix appearance for date inputs in Safari
   background-color: $input-bg;
   background-clip: padding-box;
   border: $input-border-width solid $input-border-color;
-  appearance: none; // Fix appearance for date inputs in Safari
 
   // Note: This has no effect on <select>s in some browsers, due to the limited stylability of `<select>`s in CSS.
   @include border-radius($input-border-radius, 0);
diff --git a/forms/_form-range.scss b/forms/_form-range.scss
index 6de4213..4732213 100644
--- a/forms/_form-range.scss
+++ b/forms/_form-range.scss
@@ -8,8 +8,8 @@
   width: 100%;
   height: add($form-range-thumb-height, $form-range-thumb-focus-box-shadow-width * 2);
   padding: 0; // Need to reset padding
-  background-color: transparent;
   appearance: none;
+  background-color: transparent;
 
   &:focus {
     outline: 0;
@@ -28,12 +28,12 @@
     width: $form-range-thumb-width;
     height: $form-range-thumb-height;
     margin-top: ($form-range-track-height - $form-range-thumb-height) * .5; // Webkit specific
+    appearance: none;
     @include gradient-bg($form-range-thumb-bg);
     border: $form-range-thumb-border;
     @include border-radius($form-range-thumb-border-radius);
     @include box-shadow($form-range-thumb-box-shadow);
     @include transition($form-range-thumb-transition);
-    appearance: none;
 
     &:active {
       @include gradient-bg($form-range-thumb-active-bg);
@@ -54,12 +54,12 @@
   &::-moz-range-thumb {
     width: $form-range-thumb-width;
     height: $form-range-thumb-height;
+    appearance: none;
     @include gradient-bg($form-range-thumb-bg);
     border: $form-range-thumb-border;
     @include border-radius($form-range-thumb-border-radius);
     @include box-shadow($form-range-thumb-box-shadow);
     @include transition($form-range-thumb-transition);
-    appearance: none;
 
     &:active {
       @include gradient-bg($form-range-thumb-active-bg);
diff --git a/forms/_form-select.scss b/forms/_form-select.scss
index 0b26323..69ace52 100644
--- a/forms/_form-select.scss
+++ b/forms/_form-select.scss
@@ -14,6 +14,7 @@
   font-weight: $form-select-font-weight;
   line-height: $form-select-line-height;
   color: $form-select-color;
+  appearance: none;
   background-color: $form-select-bg;
   background-image: var(--#{$prefix}form-select-bg-img), var(--#{$prefix}form-select-bg-icon, none);
   background-repeat: no-repeat;
@@ -23,7 +24,6 @@
   @include border-radius($form-select-border-radius, 0);
   @include box-shadow($form-select-box-shadow);
   @include transition($form-select-transition);
-  appearance: none;
 
   &:focus {
     border-color: $form-select-focus-border-color;
diff --git a/helpers/_color-bg.scss b/helpers/_color-bg.scss
index c00acde..1a3a4cf 100644
--- a/helpers/_color-bg.scss
+++ b/helpers/_color-bg.scss
@@ -1,8 +1,7 @@
 // All-caps `RGBA()` function used because of this Sass bug: https://github.com/sass/node-sass/issues/2251
 @each $color, $value in $theme-colors {
-  $color-rgb: to-rgb($value);
   .text-bg-#{$color} {
     color: color-contrast($value) if($enable-important-utilities, !important, null);
-    background-color: RGBA($color-rgb, var(--#{$prefix}bg-opacity, 1)) if($enable-important-utilities, !important, null);
+    background-color: RGBA(var(--#{$prefix}#{$color}-rgb), var(--#{$prefix}bg-opacity, 1)) if($enable-important-utilities, !important, null);
   }
 }
diff --git a/helpers/_vr.scss b/helpers/_vr.scss
index 9bca099..b6f9d42 100644
--- a/helpers/_vr.scss
+++ b/helpers/_vr.scss
@@ -1,7 +1,7 @@
 .vr {
   display: inline-block;
   align-self: stretch;
-  width: 1px;
+  width: $vr-border-width;
   min-height: 1em;
   background-color: currentcolor;
   opacity: $hr-opacity;
diff --git a/mixins/_banner.scss b/mixins/_banner.scss
index 4323989..aa83dcc 100644
--- a/mixins/_banner.scss
+++ b/mixins/_banner.scss
@@ -1,6 +1,6 @@
 @mixin bsBanner($file) {
   /*!
-   * Bootstrap #{$file} v5.3.0 (https://getbootstrap.com/)
+   * Bootstrap #{$file} v5.3.1 (https://getbootstrap.com/)
    * Copyright 2011-2023 The Bootstrap Authors
    * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
    */
diff --git a/package.json b/package.json
index 3c746a3..8212f2a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "bootstrap-scss",
-  "version": "5.3.0",
+  "version": "5.3.1",
   "description": "Bootstrap's SCSS files (only)",
   "main": "bootstrap.scss",
   "repository": {