diff --git a/package.json b/package.json
index 9b3c815d..d0bcb517 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
     "esbuild": "^0.19.11",
     "govuk-frontend": "^4.7.0",
     "jquery": "^3.7.1",
-    "sass": "^1.70.0",
+    "sass": "^1.77.4",
     "stimulus-reveal-controller": "^4.1.0"
   },
   "devDependencies": {
diff --git a/yarn.lock b/yarn.lock
index 8e11db63..dfdca510 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5466,7 +5466,7 @@ __metadata:
     jquery: "npm:^3.7.1"
     npm-run-all: "npm:^4.1.5"
     postcss: "npm:8"
-    sass: "npm:^1.70.0"
+    sass: "npm:^1.77.4"
     stimulus-reveal-controller: "npm:^4.1.0"
     stylelint: "npm:^16.5.0"
     stylelint-config-gds: "npm:^2.0.0"
@@ -10523,7 +10523,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"sass@npm:^1.44.0, sass@npm:^1.70.0":
+"sass@npm:^1.44.0":
   version: 1.70.0
   resolution: "sass@npm:1.70.0"
   dependencies:
@@ -10536,6 +10536,19 @@ __metadata:
   languageName: node
   linkType: hard
 
+"sass@npm:^1.77.4":
+  version: 1.77.4
+  resolution: "sass@npm:1.77.4"
+  dependencies:
+    chokidar: "npm:>=3.0.0 <4.0.0"
+    immutable: "npm:^4.0.0"
+    source-map-js: "npm:>=0.6.2 <2.0.0"
+  bin:
+    sass: sass.js
+  checksum: b9cb4882bded282aabe38d011adfce375e1f282184fcf93dc3da5d5be834c6aa53c474c15634c351ef7bd85146cfd1cc81343654cc3bcf000d78e856da4225ef
+  languageName: node
+  linkType: hard
+
 "saxes@npm:^5.0.1":
   version: 5.0.1
   resolution: "saxes@npm:5.0.1"