diff --git a/package.json b/package.json
index b0f3cdc95..10a905098 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
     "dfe-frontend": "^2.0.1",
     "esbuild": "^0.21.5",
     "govuk-frontend": "^5.3.1",
-    "sass": "^1.80.6"
+    "sass": "^1.81.0"
   },
   "devDependencies": {
     "postcss": "8",
diff --git a/yarn.lock b/yarn.lock
index 185102589..56e1355f5 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -974,7 +974,7 @@ __metadata:
     esbuild: "npm:^0.21.5"
     govuk-frontend: "npm:^5.3.1"
     postcss: "npm:8"
-    sass: "npm:^1.80.6"
+    sass: "npm:^1.81.0"
     stylelint: "npm:^16.10.0"
     stylelint-config-gds: "npm:^2.0.0"
   languageName: unknown
@@ -1230,10 +1230,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"immutable@npm:^4.0.0":
-  version: 4.3.6
-  resolution: "immutable@npm:4.3.6"
-  checksum: 7d0952a768b4fadcee47230ed86dc9505a4517095eceaf5a47e65288571c42400c6e4a2ae21eca4eda957cb7bc50720213135b62cf6a181639111f8acae128c3
+"immutable@npm:^5.0.2":
+  version: 5.0.2
+  resolution: "immutable@npm:5.0.2"
+  checksum: 0d97ad95384e49563b6ed68f90e5ea83c149fd96ff417fae8274e1c524e3ef800eb1a2e8009e29d9b8ffdf63affd7692f87c8af72714181aad8dca88747fb5ac
   languageName: node
   linkType: hard
 
@@ -1942,20 +1942,20 @@ __metadata:
   languageName: node
   linkType: hard
 
-"sass@npm:^1.80.6":
-  version: 1.80.6
-  resolution: "sass@npm:1.80.6"
+"sass@npm:^1.81.0":
+  version: 1.81.0
+  resolution: "sass@npm:1.81.0"
   dependencies:
     "@parcel/watcher": "npm:^2.4.1"
     chokidar: "npm:^4.0.0"
-    immutable: "npm:^4.0.0"
+    immutable: "npm:^5.0.2"
     source-map-js: "npm:>=0.6.2 <2.0.0"
   dependenciesMeta:
     "@parcel/watcher":
       optional: true
   bin:
     sass: sass.js
-  checksum: 04ce40d4dcf06cf2a94a66c1cc4fd4a9eb4033fd039291acd0be9d1d4123860da568c5cbef9de8493ffbedd8acae1cd0b8346f5da21c6f7cf0ffd3477730beca
+  checksum: 9c59b3c9b4231c18fcb4583cc232dbc4de501ddc11101b7a025e44833e3f3ce6031546dc1cd109ee9f04ebcfb1fe30ff870810af33b8feb9aa9e36dfba9ec1ef
   languageName: node
   linkType: hard