diff --git a/package.json b/package.json
index 505d77819..eb180d289 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
     "accessible-autocomplete": "^3.0.0",
     "axios": "^1.7.2",
     "dfe-frontend-alpha": "^1.0.0",
-    "esbuild": "^0.21.3",
+    "esbuild": "^0.21.4",
     "govuk-frontend": "^4.7.0",
     "puppeteer": "^22.10.0",
     "sass": "^1.77.4",
diff --git a/yarn.lock b/yarn.lock
index e8be703a5..79907c16c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1365,163 +1365,163 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@esbuild/aix-ppc64@npm:0.21.3":
-  version: 0.21.3
-  resolution: "@esbuild/aix-ppc64@npm:0.21.3"
+"@esbuild/aix-ppc64@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/aix-ppc64@npm:0.21.4"
   conditions: os=aix & cpu=ppc64
   languageName: node
   linkType: hard
 
-"@esbuild/android-arm64@npm:0.21.3":
-  version: 0.21.3
-  resolution: "@esbuild/android-arm64@npm:0.21.3"
+"@esbuild/android-arm64@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/android-arm64@npm:0.21.4"
   conditions: os=android & cpu=arm64
   languageName: node
   linkType: hard
 
-"@esbuild/android-arm@npm:0.21.3":
-  version: 0.21.3
-  resolution: "@esbuild/android-arm@npm:0.21.3"
+"@esbuild/android-arm@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/android-arm@npm:0.21.4"
   conditions: os=android & cpu=arm
   languageName: node
   linkType: hard
 
-"@esbuild/android-x64@npm:0.21.3":
-  version: 0.21.3
-  resolution: "@esbuild/android-x64@npm:0.21.3"
+"@esbuild/android-x64@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/android-x64@npm:0.21.4"
   conditions: os=android & cpu=x64
   languageName: node
   linkType: hard
 
-"@esbuild/darwin-arm64@npm:0.21.3":
-  version: 0.21.3
-  resolution: "@esbuild/darwin-arm64@npm:0.21.3"
+"@esbuild/darwin-arm64@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/darwin-arm64@npm:0.21.4"
   conditions: os=darwin & cpu=arm64
   languageName: node
   linkType: hard
 
-"@esbuild/darwin-x64@npm:0.21.3":
-  version: 0.21.3
-  resolution: "@esbuild/darwin-x64@npm:0.21.3"
+"@esbuild/darwin-x64@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/darwin-x64@npm:0.21.4"
   conditions: os=darwin & cpu=x64
   languageName: node
   linkType: hard
 
-"@esbuild/freebsd-arm64@npm:0.21.3":
-  version: 0.21.3
-  resolution: "@esbuild/freebsd-arm64@npm:0.21.3"
+"@esbuild/freebsd-arm64@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/freebsd-arm64@npm:0.21.4"
   conditions: os=freebsd & cpu=arm64
   languageName: node
   linkType: hard
 
-"@esbuild/freebsd-x64@npm:0.21.3":
-  version: 0.21.3
-  resolution: "@esbuild/freebsd-x64@npm:0.21.3"
+"@esbuild/freebsd-x64@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/freebsd-x64@npm:0.21.4"
   conditions: os=freebsd & cpu=x64
   languageName: node
   linkType: hard
 
-"@esbuild/linux-arm64@npm:0.21.3":
-  version: 0.21.3
-  resolution: "@esbuild/linux-arm64@npm:0.21.3"
+"@esbuild/linux-arm64@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/linux-arm64@npm:0.21.4"
   conditions: os=linux & cpu=arm64
   languageName: node
   linkType: hard
 
-"@esbuild/linux-arm@npm:0.21.3":
-  version: 0.21.3
-  resolution: "@esbuild/linux-arm@npm:0.21.3"
+"@esbuild/linux-arm@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/linux-arm@npm:0.21.4"
   conditions: os=linux & cpu=arm
   languageName: node
   linkType: hard
 
-"@esbuild/linux-ia32@npm:0.21.3":
-  version: 0.21.3
-  resolution: "@esbuild/linux-ia32@npm:0.21.3"
+"@esbuild/linux-ia32@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/linux-ia32@npm:0.21.4"
   conditions: os=linux & cpu=ia32
   languageName: node
   linkType: hard
 
-"@esbuild/linux-loong64@npm:0.21.3":
-  version: 0.21.3
-  resolution: "@esbuild/linux-loong64@npm:0.21.3"
+"@esbuild/linux-loong64@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/linux-loong64@npm:0.21.4"
   conditions: os=linux & cpu=loong64
   languageName: node
   linkType: hard
 
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-  version: 0.21.3
-  resolution: "@esbuild/linux-mips64el@npm:0.21.3"
+"@esbuild/linux-mips64el@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/linux-mips64el@npm:0.21.4"
   conditions: os=linux & cpu=mips64el
   languageName: node
   linkType: hard
 
-"@esbuild/linux-ppc64@npm:0.21.3":
-  version: 0.21.3
-  resolution: "@esbuild/linux-ppc64@npm:0.21.3"
+"@esbuild/linux-ppc64@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/linux-ppc64@npm:0.21.4"
   conditions: os=linux & cpu=ppc64
   languageName: node
   linkType: hard
 
-"@esbuild/linux-riscv64@npm:0.21.3":
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-  resolution: "@esbuild/linux-riscv64@npm:0.21.3"
+"@esbuild/linux-riscv64@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/linux-riscv64@npm:0.21.4"
   conditions: os=linux & cpu=riscv64
   languageName: node
   linkType: hard
 
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-  version: 0.21.3
-  resolution: "@esbuild/linux-s390x@npm:0.21.3"
+"@esbuild/linux-s390x@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/linux-s390x@npm:0.21.4"
   conditions: os=linux & cpu=s390x
   languageName: node
   linkType: hard
 
-"@esbuild/linux-x64@npm:0.21.3":
-  version: 0.21.3
-  resolution: "@esbuild/linux-x64@npm:0.21.3"
+"@esbuild/linux-x64@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/linux-x64@npm:0.21.4"
   conditions: os=linux & cpu=x64
   languageName: node
   linkType: hard
 
-"@esbuild/netbsd-x64@npm:0.21.3":
-  version: 0.21.3
-  resolution: "@esbuild/netbsd-x64@npm:0.21.3"
+"@esbuild/netbsd-x64@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/netbsd-x64@npm:0.21.4"
   conditions: os=netbsd & cpu=x64
   languageName: node
   linkType: hard
 
-"@esbuild/openbsd-x64@npm:0.21.3":
-  version: 0.21.3
-  resolution: "@esbuild/openbsd-x64@npm:0.21.3"
+"@esbuild/openbsd-x64@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/openbsd-x64@npm:0.21.4"
   conditions: os=openbsd & cpu=x64
   languageName: node
   linkType: hard
 
-"@esbuild/sunos-x64@npm:0.21.3":
-  version: 0.21.3
-  resolution: "@esbuild/sunos-x64@npm:0.21.3"
+"@esbuild/sunos-x64@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/sunos-x64@npm:0.21.4"
   conditions: os=sunos & cpu=x64
   languageName: node
   linkType: hard
 
-"@esbuild/win32-arm64@npm:0.21.3":
-  version: 0.21.3
-  resolution: "@esbuild/win32-arm64@npm:0.21.3"
+"@esbuild/win32-arm64@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/win32-arm64@npm:0.21.4"
   conditions: os=win32 & cpu=arm64
   languageName: node
   linkType: hard
 
-"@esbuild/win32-ia32@npm:0.21.3":
-  version: 0.21.3
-  resolution: "@esbuild/win32-ia32@npm:0.21.3"
+"@esbuild/win32-ia32@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/win32-ia32@npm:0.21.4"
   conditions: os=win32 & cpu=ia32
   languageName: node
   linkType: hard
 
-"@esbuild/win32-x64@npm:0.21.3":
-  version: 0.21.3
-  resolution: "@esbuild/win32-x64@npm:0.21.3"
+"@esbuild/win32-x64@npm:0.21.4":
+  version: 0.21.4
+  resolution: "@esbuild/win32-x64@npm:0.21.4"
   conditions: os=win32 & cpu=x64
   languageName: node
   linkType: hard
@@ -4967,33 +4967,33 @@ __metadata:
   languageName: node
   linkType: hard
 
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-  version: 0.21.3
-  resolution: "esbuild@npm:0.21.3"
-  dependencies:
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-    "@esbuild/android-arm": 0.21.3
-    "@esbuild/android-arm64": 0.21.3
-    "@esbuild/android-x64": 0.21.3
-    "@esbuild/darwin-arm64": 0.21.3
-    "@esbuild/darwin-x64": 0.21.3
-    "@esbuild/freebsd-arm64": 0.21.3
-    "@esbuild/freebsd-x64": 0.21.3
-    "@esbuild/linux-arm": 0.21.3
-    "@esbuild/linux-arm64": 0.21.3
-    "@esbuild/linux-ia32": 0.21.3
-    "@esbuild/linux-loong64": 0.21.3
-    "@esbuild/linux-mips64el": 0.21.3
-    "@esbuild/linux-ppc64": 0.21.3
-    "@esbuild/linux-riscv64": 0.21.3
-    "@esbuild/linux-s390x": 0.21.3
-    "@esbuild/linux-x64": 0.21.3
-    "@esbuild/netbsd-x64": 0.21.3
-    "@esbuild/openbsd-x64": 0.21.3
-    "@esbuild/sunos-x64": 0.21.3
-    "@esbuild/win32-arm64": 0.21.3
-    "@esbuild/win32-ia32": 0.21.3
-    "@esbuild/win32-x64": 0.21.3
+"esbuild@npm:^0.21.4":
+  version: 0.21.4
+  resolution: "esbuild@npm:0.21.4"
+  dependencies:
+    "@esbuild/aix-ppc64": 0.21.4
+    "@esbuild/android-arm": 0.21.4
+    "@esbuild/android-arm64": 0.21.4
+    "@esbuild/android-x64": 0.21.4
+    "@esbuild/darwin-arm64": 0.21.4
+    "@esbuild/darwin-x64": 0.21.4
+    "@esbuild/freebsd-arm64": 0.21.4
+    "@esbuild/freebsd-x64": 0.21.4
+    "@esbuild/linux-arm": 0.21.4
+    "@esbuild/linux-arm64": 0.21.4
+    "@esbuild/linux-ia32": 0.21.4
+    "@esbuild/linux-loong64": 0.21.4
+    "@esbuild/linux-mips64el": 0.21.4
+    "@esbuild/linux-ppc64": 0.21.4
+    "@esbuild/linux-riscv64": 0.21.4
+    "@esbuild/linux-s390x": 0.21.4
+    "@esbuild/linux-x64": 0.21.4
+    "@esbuild/netbsd-x64": 0.21.4
+    "@esbuild/openbsd-x64": 0.21.4
+    "@esbuild/sunos-x64": 0.21.4
+    "@esbuild/win32-arm64": 0.21.4
+    "@esbuild/win32-ia32": 0.21.4
+    "@esbuild/win32-x64": 0.21.4
   dependenciesMeta:
     "@esbuild/aix-ppc64":
       optional: true
@@ -5043,7 +5043,7 @@ __metadata:
       optional: true
   bin:
     esbuild: bin/esbuild
-  checksum: 4f9a71ca82500f5323943afbc39ceffd5ff4c2f20576e55568dd0e7ea95f7050efbf7739e29fa0715b75698e72870fe2b96f2fa9cce5d5021b34b64ea7e75220
+  checksum: e96ae5f15d9cad72a94d36be3cbf37bd73d5614c6c0cc6398036ee9a9b9327a1eee41a4099e536e52f1280f7d8dc7e86eb8f71d348cac4b526a6234cf8d754ab
   languageName: node
   linkType: hard
 
@@ -5479,7 +5479,7 @@ __metadata:
     accessible-autocomplete: ^3.0.0
     axios: ^1.7.2
     dfe-frontend-alpha: ^1.0.0
-    esbuild: ^0.21.3
+    esbuild: ^0.21.4
     govuk-frontend: ^4.7.0
     puppeteer: ^22.10.0
     sass: ^1.77.4