diff --git a/backend/package-lock.json b/backend/package-lock.json
index 08086c8..8ec0d75 100644
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
@@ -8,7 +8,7 @@
       "name": "dev-onboarding-backend",
       "version": "1.0.0",
       "dependencies": {
-        "@fastify/cors": "^9.0.1",
+        "@fastify/cors": "^11.2.0",
         "@fastify/websocket": "^10.0.1",
         "better-sqlite3": "^11.0.0",
         "fastify": "^4.26.0",
@@ -62,7 +62,6 @@
       "integrity": "sha512-CGOfOJqWjg2qW/Mb6zNsDm+u5vFQ8DxXfbM09z69p5Z6+mE1ikP2jUXw+j42Pf1XTYED2Rni5f95npYeuwMDQA==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@babel/code-frame": "^7.29.0",
         "@babel/generator": "^7.29.0",
@@ -709,15 +708,41 @@
       "license": "MIT"
     },
     "node_modules/@fastify/cors": {
-      "version": "9.0.1",
-      "resolved": "https://registry.npmjs.org/@fastify/cors/-/cors-9.0.1.tgz",
-      "integrity": "sha512-YY9Ho3ovI+QHIL2hW+9X4XqQjXLjJqsU+sMV/xFsxZkE8p3GNnYVFpoOxF7SsP5ZL76gwvbo3V9L+FIekBGU4Q==",
+      "version": "11.2.0",
+      "resolved": "https://registry.npmjs.org/@fastify/cors/-/cors-11.2.0.tgz",
+      "integrity": "sha512-LbLHBuSAdGdSFZYTLVA3+Ch2t+sA6nq3Ejc6XLAKiQ6ViS2qFnvicpj0htsx03FyYeLs04HfRNBsz/a8SvbcUw==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/fastify"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/fastify"
+        }
+      ],
       "license": "MIT",
       "dependencies": {
-        "fastify-plugin": "^4.0.0",
-        "mnemonist": "0.39.6"
+        "fastify-plugin": "^5.0.0",
+        "toad-cache": "^3.7.0"
       }
     },
+    "node_modules/@fastify/cors/node_modules/fastify-plugin": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/fastify-plugin/-/fastify-plugin-5.1.0.tgz",
+      "integrity": "sha512-FAIDA8eovSt5qcDgcBvDuX/v0Cjz0ohGhENZ/wpc3y+oZCY2afZ9Baqql3g/lC+OHRnciQol4ww7tuthOb9idw==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/fastify"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/fastify"
+        }
+      ],
+      "license": "MIT"
+    },
     "node_modules/@fastify/error": {
       "version": "3.4.1",
       "resolved": "https://registry.npmjs.org/@fastify/error/-/error-3.4.1.tgz",
@@ -1594,7 +1619,6 @@
       "integrity": "sha512-4Z+L8I2OqhZV8qA132M4wNL30ypZGYOQVBfMgxDH/K5UX0PNqTu1c6za9ST5r9+tavvHiTWmBnKzpCJ/GlVFtg==",
       "dev": true,
       "license": "BSD-2-Clause",
-      "peer": true,
       "dependencies": {
         "@typescript-eslint/scope-manager": "7.18.0",
         "@typescript-eslint/types": "7.18.0",
@@ -1780,7 +1804,6 @@
       "integrity": "sha512-UVJyE9MttOsBQIDKw1skb9nAwQuR5wuGD3+82K6JgJlm/Y+KI92oNsMNGZCYdDsVtRHSak0pcV5Dno5+4jh9sw==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "bin": {
         "acorn": "bin/acorn"
       },
@@ -2257,7 +2280,6 @@
         }
       ],
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "baseline-browser-mapping": "^2.10.12",
         "caniuse-lite": "^1.0.30001782",
@@ -2895,7 +2917,6 @@
       "deprecated": "This version is no longer supported. Please see https://eslint.org/version-support for other options.",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@eslint-community/eslint-utils": "^4.2.0",
         "@eslint-community/regexpp": "^4.6.1",
@@ -4002,7 +4023,6 @@
       "integrity": "sha512-NIy3oAFp9shda19hy4HK0HRTWKtPJmGdnvywu01nOqNC2vZg+Z+fvJDxpMQA88eb2I9EcafcdjYgsDthnYTvGw==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@jest/core": "^29.7.0",
         "@jest/types": "^29.6.3",
@@ -4916,15 +4936,6 @@
       "integrity": "sha512-gKLcREMhtuZRwRAfqP3RFW+TK4JqApVBtOIftVgjuABpAtpxhPGaDcfvbhNvD0B8iD1oUr/txX35NjcaY6Ns/A==",
       "license": "MIT"
     },
-    "node_modules/mnemonist": {
-      "version": "0.39.6",
-      "resolved": "https://registry.npmjs.org/mnemonist/-/mnemonist-0.39.6.tgz",
-      "integrity": "sha512-A/0v5Z59y63US00cRSLiloEIw3t5G+MiKz4BhX21FI+YBJXBOGW0ohFxTxO08dsOYlzxo87T7vGfZKYp2bcAWA==",
-      "license": "MIT",
-      "dependencies": {
-        "obliterator": "^2.0.1"
-      }
-    },
     "node_modules/ms": {
       "version": "2.1.3",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
@@ -5018,12 +5029,6 @@
         "node": ">=0.10.0"
       }
     },
-    "node_modules/obliterator": {
-      "version": "2.0.5",
-      "resolved": "https://registry.npmjs.org/obliterator/-/obliterator-2.0.5.tgz",
-      "integrity": "sha512-42CPE9AhahZRsMNslczq0ctAEtqk8Eka26QofnqC346BZdHDySk3LWka23LI7ULIw11NmltpiLagIq8gBozxTw==",
-      "license": "MIT"
-    },
     "node_modules/on-exit-leak-free": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/on-exit-leak-free/-/on-exit-leak-free-2.1.2.tgz",
diff --git a/backend/package.json b/backend/package.json
index ed6e781..511a9fb 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -12,7 +12,7 @@
   },
   "dependencies": {
     "fastify": "^4.26.0",
-    "@fastify/cors": "^9.0.1",
+    "@fastify/cors": "^11.2.0",
     "@fastify/websocket": "^10.0.1",
     "socket.io": "^4.7.4",
     "better-sqlite3": "^11.0.0",