diff --git a/package.json b/package.json
index 2e641fa481..77d7314770 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
     "ansi-html-community": "0.0.8",
     "channels": "^0.0.4",
     "cookieconsent": "^3.1.0",
-    "core-js": "^3.12.0",
+    "core-js": "^3.40.0",
     "dotenv-webpack": "^8.0.1",
     "flatpickr": "^4.6.9",
     "govuk-frontend": "5.4.0",
diff --git a/yarn.lock b/yarn.lock
index 55ddd18a44..523a2c108f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3542,13 +3542,20 @@ __metadata:
   languageName: node
   linkType: hard
 
-"core-js@npm:^3.12.0, core-js@npm:^3.16.2":
+"core-js@npm:^3.16.2":
   version: 3.26.0
   resolution: "core-js@npm:3.26.0"
   checksum: 0149eb9d3909fde9c17626af3a6e625c326e8598d0bb5e6c5b48a18e5fcd4eaf48d4964d873667d8148542ff590fb98eb3f93618da114ca54999d6bc0349734b
   languageName: node
   linkType: hard
 
+"core-js@npm:^3.40.0":
+  version: 3.40.0
+  resolution: "core-js@npm:3.40.0"
+  checksum: fc962b93470fd4a129555c765b630c1741fc38706bca68779879f0feaef3b6eec11a33904e3111b2b0e8ba206e8cfbc2a70193271227cfa2f2d13a986f78e557
+  languageName: node
+  linkType: hard
+
 "core-util-is@npm:~1.0.0":
   version: 1.0.3
   resolution: "core-util-is@npm:1.0.3"
@@ -7799,7 +7806,7 @@ __metadata:
     ansi-html-community: 0.0.8
     channels: ^0.0.4
     cookieconsent: ^3.1.0
-    core-js: ^3.12.0
+    core-js: ^3.40.0
     dotenv-webpack: ^8.0.1
     eslint: ^7.25
     eslint-config-prettier: ^8.3.0