diff --git a/package.json b/package.json
index a93081f39..70217f578 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "dependencies": {
     "esbuild": "^0.24.0",
     "govuk-frontend": "5.5.0",
-    "sass": "^1.80.2",
+    "sass": "^1.81.0",
     "puppeteer": "22.6.1"
   },
   "scripts": {
diff --git a/yarn.lock b/yarn.lock
index 541266962..d912185de 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -669,10 +669,10 @@ ieee754@^1.1.13:
   resolved "https://registry.yarnpkg.com/ieee754/-/ieee754-1.2.1.tgz#8eb7a10a63fff25d15a57b001586d177d1b0d352"
   integrity sha512-dcyqhDvX1C46lXZcVqCpK+FtMRQVdIMN6/Df5js2zouUsqG7I6sFxitIC+7KYK29KdXOLHdu9zL4sFnoVQnqaA==
 
-immutable@^4.0.0:
-  version "4.1.0"
-  resolved "https://registry.yarnpkg.com/immutable/-/immutable-4.1.0.tgz#f795787f0db780183307b9eb2091fcac1f6fafef"
-  integrity sha512-oNkuqVTA8jqG1Q6c+UglTOD1xhC1BtjKI7XkCXRkZHrN5m18/XsnUp8Q89GkQO/z+0WjonSvl0FLhDYftp46nQ==
+immutable@^5.0.2:
+  version "5.0.2"
+  resolved "https://registry.yarnpkg.com/immutable/-/immutable-5.0.2.tgz#bb8a987349a73efbe6b3b292a9cbaf1b530d296b"
+  integrity sha512-1NU7hWZDkV7hJ4PJ9dur9gTNQ4ePNPN4k9/0YhwjzykTi/+3Q5pF93YU5QoVj8BuOnhLgaY8gs0U2pj4kSYVcw==
 
 import-fresh@^3.3.0:
   version "3.3.0"
@@ -923,15 +923,16 @@ resolve-from@^4.0.0:
   resolved "https://registry.yarnpkg.com/resolve-from/-/resolve-from-4.0.0.tgz#4abcd852ad32dd7baabfe9b40e00a36db5f392e6"
   integrity sha512-pb/MYmXstAkysRFx8piNI1tGFNQIFA3vkE3Gq4EuA1dF6gHp/+vgZqsCGJapvy8N3Q+4o7FwvquPJcnZ7RYy4g==
 
-sass@^1.80.2:
-  version "1.80.2"
-  resolved "https://registry.yarnpkg.com/sass/-/sass-1.80.2.tgz#9d13d85a4f81bb17e09d1dc3e1c0944f7fd7315e"
-  integrity sha512-9wXY8cGBlUmoUoT+vwOZOFCiS+naiWVjqlreN9ar9PudXbGwlMTFwCR5K9kB4dFumJ6ib98wZyAObJKsWf1nAA==
+sass@^1.81.0:
+  version "1.81.0"
+  resolved "https://registry.yarnpkg.com/sass/-/sass-1.81.0.tgz#a9010c0599867909dfdbad057e4a6fbdd5eec941"
+  integrity sha512-Q4fOxRfhmv3sqCLoGfvrC9pRV8btc0UtqL9mN6Yrv6Qi9ScL55CVH1vlPP863ISLEEMNLLuu9P+enCeGHlnzhA==
   dependencies:
-    "@parcel/watcher" "^2.4.1"
     chokidar "^4.0.0"
-    immutable "^4.0.0"
+    immutable "^5.0.2"
     source-map-js ">=0.6.2 <2.0.0"
+  optionalDependencies:
+    "@parcel/watcher" "^2.4.1"
 
 semver@7.6.0:
   version "7.6.0"