diff --git a/package-lock.json b/package-lock.json
index d5c0466..61b55aa 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,7 +14,7 @@
         "govuk-frontend": "^5.14.0",
         "http-server": "^14.1.1",
         "rimraf": "^6.0.0",
-        "sass": "^1.80.5"
+        "sass": "^1.99.0"
       },
       "devDependencies": {
         "standard": "^17.1.0",
@@ -4163,9 +4163,9 @@
       }
     },
     "node_modules/immutable": {
-      "version": "5.1.4",
-      "resolved": "https://registry.npmjs.org/immutable/-/immutable-5.1.4.tgz",
-      "integrity": "sha512-p6u1bG3YSnINT5RQmx/yRZBpenIl30kVxkTLDyHLIMk0gict704Q9n+thfDI7lTRm9vXdDYutVzXhzcThxTnXA==",
+      "version": "5.1.5",
+      "resolved": "https://registry.npmjs.org/immutable/-/immutable-5.1.5.tgz",
+      "integrity": "sha512-t7xcm2siw+hlUM68I+UEOK+z84RzmN59as9DZ7P1l0994DKUWV7UXBMQZVxaoMSRQ+PBZbHCOoBt7a2wxOMt+A==",
       "license": "MIT"
     },
     "node_modules/import-fresh": {
@@ -6581,13 +6581,13 @@
       "license": "MIT"
     },
     "node_modules/sass": {
-      "version": "1.97.2",
-      "resolved": "https://registry.npmjs.org/sass/-/sass-1.97.2.tgz",
-      "integrity": "sha512-y5LWb0IlbO4e97Zr7c3mlpabcbBtS+ieiZ9iwDooShpFKWXf62zz5pEPdwrLYm+Bxn1fnbwFGzHuCLSA9tBmrw==",
+      "version": "1.99.0",
+      "resolved": "https://registry.npmjs.org/sass/-/sass-1.99.0.tgz",
+      "integrity": "sha512-kgW13M54DUB7IsIRM5LvJkNlpH+WhMpooUcaWGFARkF1Tc82v9mIWkCbCYf+MBvpIUBSeSOTilpZjEPr2VYE6Q==",
       "license": "MIT",
       "dependencies": {
         "chokidar": "^4.0.0",
-        "immutable": "^5.0.2",
+        "immutable": "^5.1.5",
         "source-map-js": ">=0.6.2 <2.0.0"
       },
       "bin": {
diff --git a/package.json b/package.json
index 4a8daa6..d3f1014 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
     "govuk-frontend": "^5.14.0",
     "http-server": "^14.1.1",
     "rimraf": "^6.0.0",
-    "sass": "^1.80.5"
+    "sass": "^1.99.0"
   },
   "devDependencies": {
     "standard": "^17.1.0",