diff --git a/UNRELEASED-v9.md b/UNRELEASED-v9.md
index 7059190c501..7dc0e14acef 100644
--- a/UNRELEASED-v9.md
+++ b/UNRELEASED-v9.md
@@ -41,6 +41,7 @@ Use [the changelog guidelines](/documentation/Versioning%20and%20changelog.md) t
 - Removed the `unstyled-link()` mixin and replaced any instances with values ([#4951](https://github.com/Shopify/polaris-react/pull/4951))
 - Removed the `unstyled-list()` mixin and replaced any instances with values ([#4960](https://github.com/Shopify/polaris-react/pull/4960))
 - Removed `high-contrast-outline()` and `high-contrast-border()` mixins and replaced any instances with tokens and values ([#4962](https://github.com/Shopify/polaris-react/pull/4962))
+- Removed the `map-extend` scss function ([#4970](https://github.com/Shopify/polaris-react/pull/4970))
 
 ### New components
 
diff --git a/src/styles/_common.scss b/src/styles/_common.scss
index 2c33c72521e..20b70a3d932 100644
--- a/src/styles/_common.scss
+++ b/src/styles/_common.scss
@@ -4,7 +4,6 @@
 
 // stylelint-disable scss/partial-no-import
 
-@import './foundation/utilities';
 @import './foundation/layout';
 @import './foundation/focus-ring';
 
diff --git a/src/styles/_public-api.scss b/src/styles/_public-api.scss
index cf01a30861b..fb9988db34e 100644
--- a/src/styles/_public-api.scss
+++ b/src/styles/_public-api.scss
@@ -16,7 +16,6 @@
 
 // stylelint-disable scss/partial-no-import
 
-@import './foundation/utilities';
 @import './foundation/layout';
 @import './foundation/focus-ring';
 
diff --git a/src/styles/foundation/_utilities.scss b/src/styles/foundation/_utilities.scss
deleted file mode 100644
index f95daea0fdc..00000000000
--- a/src/styles/foundation/_utilities.scss
+++ /dev/null
@@ -1,22 +0,0 @@
-// Merge multiple maps into one.
-// @param {Map} $map - Initial default map.
-// @param {ArgList} $maps - Other maps to merge.
-// @return {Map} The final merged map.
-@function map-extend($map, $maps...) {
-  @for $i from 1 through length($maps) {
-    @each $key, $value in nth($maps, $i) {
-      $map: map-merge(
-        $map,
-        (
-          $key: $value,
-        )
-      );
-
-      @if type-of($value) == map and type-of(map-get($map, $key)) == map {
-        $value: map-extend(map-get($map, $key), $value);
-      }
-    }
-  }
-
-  @return $map;
-}