diff --git a/package.json b/package.json
index 9eced899b..471b42b2f 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "esbuild": "^0.24.0",
     "govuk-frontend": "^5.3.1",
     "puppeteer": "^22.14.0",
-    "sass": "^1.80.4"
+    "sass": "^1.81.0"
   },
   "devDependencies": {
     "stylelint": "^16.9.0",
diff --git a/yarn.lock b/yarn.lock
index 58e3fb122..d94ecc9e2 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1297,7 +1297,7 @@ __metadata:
     esbuild: "npm:^0.24.0"
     govuk-frontend: "npm:^5.3.1"
     puppeteer: "npm:^22.14.0"
-    sass: "npm:^1.80.4"
+    sass: "npm:^1.81.0"
     stylelint: "npm:^16.9.0"
     stylelint-config-gds: "npm:^2.0.0"
   languageName: unknown
@@ -1646,10 +1646,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"immutable@npm:^4.0.0":
-  version: 4.3.6
-  resolution: "immutable@npm:4.3.6"
-  checksum: 59fedb67f26e265035616b27e33ef90b53b434cf76fb09212ec2d6ae32ee8d2fe2641e6dc32dbc78498c521fbf5f72c6740d39affba63a0a36a3884272371857
+"immutable@npm:^5.0.2":
+  version: 5.0.2
+  resolution: "immutable@npm:5.0.2"
+  checksum: 89b1117c610024b7a9214eade8b9f1ed38b00c82235f119515cfa5eaf26270eccbc803296d4c3c12f53e50802f042f84d811998910b866363913720da768472e
   languageName: node
   linkType: hard
 
@@ -2513,17 +2513,20 @@ __metadata:
   languageName: node
   linkType: hard
 
-"sass@npm:^1.80.4":
-  version: 1.80.4
-  resolution: "sass@npm:1.80.4"
+"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: a30d5c2313eda3e9100bfd00fd51fc030cfe7611c492268473ec0fd718180503cdebc23f7237bd61405ef6e653937d7bb972df7dcf4dffeef4f47fd9951f081e
+  checksum: f5acce5c3bb4bde6851def112e094eed20ed062e195350cea42e98bee317cf0dbcf8a6ee44222f8826437f81562fb87b840728612b0301851f7bc6d853d9142c
   languageName: node
   linkType: hard