diff --git a/package.json b/package.json
index b866e343..cb230c85 100644
--- a/package.json
+++ b/package.json
@@ -88,7 +88,7 @@
     "cookie": "^1.1.1",
     "eslint": "^9.39.4",
     "eslint-plugin-mocha": "^5.3.0",
-    "fetch-mock": "^6.4.2",
+    "fetch-mock": "^12.0.0",
     "gulp": "^4.0.2",
     "gulp-livereload": "^3.8.1",
     "gulp-nodemon": "^2.5.0",
diff --git a/yarn.lock b/yarn.lock
index 11ec62ea..0e7842a0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1917,6 +1917,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/glob-to-regexp@npm:^0.4.4":
+  version: 0.4.4
+  resolution: "@types/glob-to-regexp@npm:0.4.4"
+  checksum: 10/be9c924d664592a16129c825aa392365335ce455c34e1c9d3f6dd8b45371088bb5d4a45bbb576559f2b63d4f8bcf464cbd5baafb08cdf89b71d3b6a79356b747
+  languageName: node
+  linkType: hard
+
 "@types/json-schema@npm:^7.0.15":
   version: 7.0.15
   resolution: "@types/json-schema@npm:7.0.15"
@@ -2670,18 +2677,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"babel-polyfill@npm:^6.26.0":
-  version: 6.26.0
-  resolution: "babel-polyfill@npm:6.26.0"
-  dependencies:
-    babel-runtime: "npm:^6.26.0"
-    core-js: "npm:^2.5.0"
-    regenerator-runtime: "npm:^0.10.5"
-  checksum: 10/2abfe4bf4af39c7b0c42af8ccce14897aefbde6547a227e36f4f12ba5795e8603d2964cc72ceb59086b5a69fafcb00b0deda5c1055e373c3bef76dcc517d6d0d
-  languageName: node
-  linkType: hard
-
-"babel-runtime@npm:^6.20.0, babel-runtime@npm:^6.26.0":
+"babel-runtime@npm:^6.20.0":
   version: 6.26.0
   resolution: "babel-runtime@npm:6.26.0"
   dependencies:
@@ -3143,7 +3139,7 @@ __metadata:
     express-force-ssl: "npm:^0.3.2"
     express-nunjucks: "npm:^2.2.5"
     fast-csv: "npm:^4.3.6"
-    fetch-mock: "npm:^6.4.2"
+    fetch-mock: "npm:^12.0.0"
     form-data: "npm:^4.0.4"
     formidable: "npm:^3.5.4"
     govuk-elements-sass: "npm:~3.1.0"
@@ -3797,7 +3793,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"core-js@npm:^2.4.0, core-js@npm:^2.5.0":
+"core-js@npm:^2.4.0":
   version: 2.6.12
   resolution: "core-js@npm:2.6.12"
   checksum: 10/7c624eb00a59c74c769d5d80f751f3bf1fc6201205b6562f27286ad5e00bbca1483f2f7eb0c2854b86f526ef5c7dc958b45f2ff536f8a31b8e9cb1a13a96efca
@@ -4110,6 +4106,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"dequal@npm:^2.0.3":
+  version: 2.0.3
+  resolution: "dequal@npm:2.0.3"
+  checksum: 10/6ff05a7561f33603df87c45e389c9ac0a95e3c056be3da1a0c4702149e3a7f6fe5ffbb294478687ba51a9e95f3a60e8b6b9005993acd79c292c7d15f71964b6b
+  languageName: node
+  linkType: hard
+
 "destroy@npm:1.2.0":
   version: 1.2.0
   resolution: "destroy@npm:1.2.0"
@@ -5154,14 +5157,15 @@ __metadata:
   languageName: node
   linkType: hard
 
-"fetch-mock@npm:^6.4.2":
-  version: 6.5.2
-  resolution: "fetch-mock@npm:6.5.2"
+"fetch-mock@npm:^12.0.0":
+  version: 12.6.0
+  resolution: "fetch-mock@npm:12.6.0"
   dependencies:
-    babel-polyfill: "npm:^6.26.0"
-    glob-to-regexp: "npm:^0.4.0"
-    path-to-regexp: "npm:^2.2.1"
-  checksum: 10/62101326e3ea3198b601de335f2b1b68eca649bfde15e8fdd8936c2f847218a764c984abe02df544695e7f6abcd2edca30a1df1f1a634a85a70c25d2572e630b
+    "@types/glob-to-regexp": "npm:^0.4.4"
+    dequal: "npm:^2.0.3"
+    glob-to-regexp: "npm:^0.4.1"
+    regexparam: "npm:^3.0.0"
+  checksum: 10/9724a0e3af5d897b990fcc5c636b51491269b21bbad2cb76a1551f16a4ec4d6646c68ed27ba2d03b823961bb7533bbeb7ab606c911e888f9c02cec71cfc9c5ab
   languageName: node
   linkType: hard
 
@@ -5792,7 +5796,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"glob-to-regexp@npm:^0.4.0":
+"glob-to-regexp@npm:^0.4.1":
   version: 0.4.1
   resolution: "glob-to-regexp@npm:0.4.1"
   checksum: 10/9009529195a955c40d7b9690794aeff5ba665cc38f1519e111c58bb54366fd0c106bde80acf97ba4e533208eb53422c83b136611a54c5fefb1edd8dc267cb62e
@@ -9893,13 +9897,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"regenerator-runtime@npm:^0.10.5":
-  version: 0.10.5
-  resolution: "regenerator-runtime@npm:0.10.5"
-  checksum: 10/a10d9a2510ee0ec2603f2fc316bff0233b7f41702dc69a19b6a23442395a7be9247668f06e5b7a81577d0e3ef677a11c8c63b4edd7a16f1550e5b8fb22173346
-  languageName: node
-  linkType: hard
-
 "regenerator-runtime@npm:^0.11.0":
   version: 0.11.1
   resolution: "regenerator-runtime@npm:0.11.1"
@@ -9907,6 +9904,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"regexparam@npm:^3.0.0":
+  version: 3.0.0
+  resolution: "regexparam@npm:3.0.0"
+  checksum: 10/80574803cb9f31d1ec7b10ce1db5be629868794ce331c7098fd9725c4c0891347c2fedc18b17de17bda2441da6ef30218b1ad2d481a4081e33ef773de04f9082
+  languageName: node
+  linkType: hard
+
 "release-zalgo@npm:^1.0.0":
   version: 1.0.0
   resolution: "release-zalgo@npm:1.0.0"