diff --git a/styles/pom.xml b/styles/pom.xml
index 06f283d..1d913b9 100755
--- a/styles/pom.xml
+++ b/styles/pom.xml
@@ -13,11 +13,7 @@
     <properties>
         <scss.inputDir>${project.basedir}/src</scss.inputDir>
         <css.outputDir>${project.basedir}/dist</css.outputDir>
-        <!-- JavaFX doesn't support HSL colors. Replace all of them with RGBA
-             equivalents before bumping this. Older Dark SASS versions compile
-             HSL colors to HEX format, whereas newer version do not do this.
-        -->
-        <sass.version>1.49.9</sass.version>
+        <sass.version>1.54.4</sass.version>
     </properties>
 
     <build>
diff --git a/styles/src/settings/_palette.scss b/styles/src/settings/_palette.scss
index f3f89d8..3e61406 100644
--- a/styles/src/settings/_palette.scss
+++ b/styles/src/settings/_palette.scss
@@ -16,7 +16,7 @@ $canvas-inset:         #f6f8fa !default;
 $canvas-subtle:        #f6f8fa !default;
 
 $border-default:       #d0d7de !default;
-$border-muted:         hsla(210, 18%, 87%, 1) !default;
+$border-muted:         rgba(215, 221, 227, 1) !default;
 $border-subtle:        rgba(27, 31, 36, 0.15) !default;
 
 $neutral-emphasisPlus: #24292f !default;