diff --git a/lambdas/example-lambda/package.json b/lambdas/example-lambda/package.json
index b7bc3dd..166912b 100644
--- a/lambdas/example-lambda/package.json
+++ b/lambdas/example-lambda/package.json
@@ -8,7 +8,7 @@
     "@types/aws-lambda": "^8.10.148",
     "@types/jest": "^29.5.14",
     "jest": "^29.7.0",
-    "jest-mock-extended": "^3.0.7",
+    "jest-mock-extended": "^4.0.0",
     "typescript": "^5.8.2"
   },
   "name": "nhs-notify-repository-template-example-lambda",
diff --git a/package-lock.json b/package-lock.json
index 8ea157a..b9513d7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -34,7 +34,7 @@
         "jest": "^29.7.0",
         "jest-environment-jsdom": "^30.3.0",
         "jest-html-reporter": "^3.10.2",
-        "jest-mock-extended": "^3.0.7",
+        "jest-mock-extended": "^4.0.0",
         "lcov-result-merger": "^5.0.1",
         "ts-jest": "^29.3.0",
         "ts-node": "^10.9.2",
@@ -52,7 +52,7 @@
         "@types/aws-lambda": "^8.10.148",
         "@types/jest": "^29.5.14",
         "jest": "^29.7.0",
-        "jest-mock-extended": "^3.0.7",
+        "jest-mock-extended": "^4.0.0",
         "typescript": "^5.8.2"
       }
     },
@@ -7194,16 +7194,17 @@
       }
     },
     "node_modules/jest-mock-extended": {
-      "version": "3.0.7",
-      "resolved": "https://registry.npmjs.org/jest-mock-extended/-/jest-mock-extended-3.0.7.tgz",
-      "integrity": "sha512-7lsKdLFcW9B9l5NzZ66S/yTQ9k8rFtnwYdCNuRU/81fqDWicNDVhitTSPnrGmNeNm0xyw0JHexEOShrIKRCIRQ==",
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/jest-mock-extended/-/jest-mock-extended-4.0.0.tgz",
+      "integrity": "sha512-7BZpfuvLam+/HC+NxifIi9b+5VXj/utUDMPUqrDJehGWVuXPtLS9Jqlob2mJLrI/pg2k1S8DMfKDvEB88QNjaQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "ts-essentials": "^10.0.0"
+        "ts-essentials": "^10.0.2"
       },
       "peerDependencies": {
-        "jest": "^24.0.0 || ^25.0.0 || ^26.0.0 || ^27.0.0 || ^28.0.0 || ^29.0.0",
+        "@jest/globals": "^28.0.0 || ^29.0.0 || ^30.0.0",
+        "jest": "^24.0.0 || ^25.0.0 || ^26.0.0 || ^27.0.0 || ^28.0.0 || ^29.0.0 || ^30.0.0",
         "typescript": "^3.0.0 || ^4.0.0 || ^5.0.0"
       }
     },
diff --git a/package.json b/package.json
index 257e29c..312665d 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
     "jest": "^29.7.0",
     "jest-environment-jsdom": "^30.3.0",
     "jest-html-reporter": "^3.10.2",
-    "jest-mock-extended": "^3.0.7",
+    "jest-mock-extended": "^4.0.0",
     "lcov-result-merger": "^5.0.1",
     "ts-jest": "^29.3.0",
     "ts-node": "^10.9.2",