diff --git a/package.json b/package.json
index 7f59c8609..6e2658bf8 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": "^1.77.1",
     "stimulus-reveal-controller": "^4.1.0"
   },
   "devDependencies": {
diff --git a/yarn.lock b/yarn.lock
index 562f94af3..fe416f248 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5375,7 +5375,7 @@ __metadata:
     govuk-frontend: "npm:^4.7.0"
     jquery: "npm:^3.7.1"
     npm-run-all: "npm:^4.1.5"
-    sass: "npm:^1.70.0"
+    sass: "npm:^1.77.1"
     stimulus-reveal-controller: "npm:^4.1.0"
   languageName: unknown
   linkType: soft
@@ -10317,7 +10317,7 @@ __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:
@@ -10330,6 +10330,19 @@ __metadata:
   languageName: node
   linkType: hard
 
+"sass@npm:^1.77.1":
+  version: 1.77.1
+  resolution: "sass@npm:1.77.1"
+  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: edcfc7d038234b1198c3ddcac5963fcd1e17a9c1ee0f9bd09784ab5353b60ff50b189b4c9154b34f5da9ca0eaab8b189fd3e83a4b43a494151ad4735f8e5f364
+  languageName: node
+  linkType: hard
+
 "saxes@npm:^5.0.1":
   version: 5.0.1
   resolution: "saxes@npm:5.0.1"