diff --git a/scss/_core.scss b/scss/_core.scss
index e5a87b59d..009eb043c 100644
--- a/scss/_core.scss
+++ b/scss/_core.scss
@@ -1,9 +1,11 @@
 // Base Class Definition
 // -------------------------
 
+@use "sass:list";
+
 .#{$fa-css-prefix} {
   display: inline-block;
-  font: normal normal normal #{$fa-font-size-base}/#{$fa-line-height-base} #{$fa-font-family}; // shortening font declaration
+  font: normal normal normal list.slash($fa-font-size-base, $fa-line-height-base) #{$fa-font-family}; // shortening font declaration
   font-size: inherit; // can't have font-size inherit on line above, so need to override
   text-rendering: auto; // optimizelegibility throws things off #1094
   -webkit-font-smoothing: antialiased;
diff --git a/scss/_fixed-width.scss b/scss/_fixed-width.scss
index b221c9813..5411f9538 100644
--- a/scss/_fixed-width.scss
+++ b/scss/_fixed-width.scss
@@ -1,6 +1,8 @@
 // Fixed Width Icons
 // -------------------------
+@use "sass:math";
+
 .#{$fa-css-prefix}-fw {
-  width: (18em / 14);
+  width: math.div(18em, 14);
   text-align: center;
 }
diff --git a/scss/_larger.scss b/scss/_larger.scss
index 41e9a8184..a4065941f 100644
--- a/scss/_larger.scss
+++ b/scss/_larger.scss
@@ -2,9 +2,11 @@
 // -------------------------
 
 /* makes the font 33% larger relative to the icon container */
+@use "sass:math";
+
 .#{$fa-css-prefix}-lg {
-  font-size: (4em / 3);
-  line-height: (3em / 4);
+  font-size: math.div(4em, 3);
+  line-height: (3em * 0.25);
   vertical-align: -15%;
 }
 .#{$fa-css-prefix}-2x { font-size: 2em; }
diff --git a/scss/_list.scss b/scss/_list.scss
index 7d1e4d54d..988e6f87a 100644
--- a/scss/_list.scss
+++ b/scss/_list.scss
@@ -1,6 +1,8 @@
 // List Icons
 // -------------------------
 
+@use "sass:math";
+
 .#{$fa-css-prefix}-ul {
   padding-left: 0;
   margin-left: $fa-li-width;
@@ -11,9 +13,9 @@
   position: absolute;
   left: -$fa-li-width;
   width: $fa-li-width;
-  top: (2em / 14);
+  top: math.div(2em, 14);
   text-align: center;
   &.#{$fa-css-prefix}-lg {
-    left: -$fa-li-width + (4em / 14);
+    left: -$fa-li-width + math.div(4em, 14);
   }
 }
diff --git a/scss/_mixins.scss b/scss/_mixins.scss
index 6fdb12847..3a6d9f87c 100644
--- a/scss/_mixins.scss
+++ b/scss/_mixins.scss
@@ -1,9 +1,11 @@
 // Mixins
 // --------------------------
 
+@use "sass:list";
+
 @mixin fa-icon() {
   display: inline-block;
-  font: normal normal normal #{$fa-font-size-base}/#{$fa-line-height-base} #{$fa-font-family}; // shortening font declaration
+  font: normal normal normal list.slash($fa-font-size-base, $fa-line-height-base) #{$fa-font-family}; // shortening font declaration
   font-size: inherit; // can't have font-size inherit on line above, so need to override
   text-rendering: auto; // optimizelegibility throws things off #1094
   -webkit-font-smoothing: antialiased;
diff --git a/scss/_variables.scss b/scss/_variables.scss
index 3a8abf3d9..415ad1e2d 100644
--- a/scss/_variables.scss
+++ b/scss/_variables.scss
@@ -1,6 +1,8 @@
 // Variables
 // --------------------------
 
+@use "sass:math";
+
 $fa-font-path:        "../fonts" !default;
 $fa-font-size-base:   14px !default;
 $fa-line-height-base: 1 !default;
@@ -9,7 +11,7 @@ $fa-font-family:      "ForkAwesome" !default;
 $fa-version:          "1.2.0" !default;
 $fa-border-color:     #eee !default;
 $fa-inverse:          #fff !default;
-$fa-li-width:         (30em / 14) !default;
+$fa-li-width:         math.div(30em, 14) !default;
 
 $fa-var-500px: \f26e;
 $fa-var-activitypub: \f2f2;