diff --git a/backend/package-lock.json b/backend/package-lock.json
index 6324386..38c4db0 100644
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
@@ -7,7 +7,7 @@
     "": {
       "name": "backend",
       "version": "0.0.1",
-      "license": "UNLICENSED",
+      "license": "MIT",
       "dependencies": {
         "@nestjs-modules/ioredis": "^2.0.2",
         "@nestjs/common": "^11.1.3",
@@ -22,7 +22,7 @@
         "@nestjs/serve-static": "^5.0.3",
         "@nestjs/swagger": "^11.2.0",
         "@nestjs/terminus": "^11.0.0",
-        "@nestjs/typeorm": "^11.0.0",
+        "@nestjs/typeorm": "^11.0.3",
         "@nestjs/websockets": "^11.0.10",
         "aws-sdk": "^2.1692.0",
         "axios": "^1.0.0",
@@ -32,6 +32,7 @@
         "class-transformer": "^0.5.1",
         "class-validator": "^0.14.2",
         "dotenv": "^16.4.7",
+        "helmet": "^8.0.0",
         "ioredis": "^5.6.1",
         "ip2location-nodejs": "^9.6.3",
         "joi": "^17.0.0",
@@ -47,7 +48,8 @@
         "stripe": "^8.0.0",
         "swagger-ui-express": "^5.0.1",
         "typeorm": "^0.3.25",
-        "uuid": "^11.1.0"
+        "uuid": "^11.1.0",
+        "zod": "^4.4.3"
       },
       "devDependencies": {
         "@nestjs/cli": "^10.0.0",
@@ -68,6 +70,7 @@
         "eslint": "^8.0.0",
         "eslint-config-prettier": "^9.0.0",
         "eslint-plugin-prettier": "^5.0.0",
+        "fast-check": "^3.23.2",
         "jest": "^29.5.0",
         "prettier": "^3.0.0",
         "source-map-support": "^0.5.21",
@@ -2340,15 +2343,16 @@
       }
     },
     "node_modules/@nestjs/typeorm": {
-      "version": "11.0.0",
-      "resolved": "https://registry.npmjs.org/@nestjs/typeorm/-/typeorm-11.0.0.tgz",
-      "integrity": "sha512-SOeUQl70Lb2OfhGkvnh4KXWlsd+zA08RuuQgT7kKbzivngxzSo1Oc7Usu5VxCxACQC9wc2l9esOHILSJeK7rJA==",
+      "version": "11.0.3",
+      "resolved": "https://registry.npmjs.org/@nestjs/typeorm/-/typeorm-11.0.3.tgz",
+      "integrity": "sha512-zJ+E5l7auVVA7c0PsvcMdyvRPKTUqU5s2ToYmOA2QEsXQ42qbUGtK4+1HlRfpHqBkCSXP+phiH4luvf9DyJNog==",
+      "license": "MIT",
       "peerDependencies": {
         "@nestjs/common": "^10.0.0 || ^11.0.0",
         "@nestjs/core": "^10.0.0 || ^11.0.0",
         "reflect-metadata": "^0.1.13 || ^0.2.0",
         "rxjs": "^7.2.0",
-        "typeorm": "^0.3.0"
+        "typeorm": "^0.3.0 || ^1.0.0-dev"
       }
     },
     "node_modules/@nestjs/websockets": {
@@ -6000,6 +6004,29 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/fast-check": {
+      "version": "3.23.2",
+      "resolved": "https://registry.npmjs.org/fast-check/-/fast-check-3.23.2.tgz",
+      "integrity": "sha512-h5+1OzzfCC3Ef7VbtKdcv7zsstUQwUDlYpUTvjeUsJAssPgLn7QzbboPtL5ro04Mq0rPOsMzl7q5hIbRs2wD1A==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://github.com/sponsors/dubzzz"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/fast-check"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "pure-rand": "^6.1.0"
+      },
+      "engines": {
+        "node": ">=8.0.0"
+      }
+    },
     "node_modules/fast-deep-equal": {
       "version": "3.1.3",
       "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz",
@@ -6753,6 +6780,18 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/helmet": {
+      "version": "8.3.0",
+      "resolved": "https://registry.npmjs.org/helmet/-/helmet-8.3.0.tgz",
+      "integrity": "sha512-Qgpiaws3Sm30Av8Eah6sjMCZZwjlBu+E68rhpCWBshY1lb09HtLwj5GviX0OyQIn+ulUS0iX0AxN5n3tLZzz1w==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/EvanHahn"
+      }
+    },
     "node_modules/hexoid": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/hexoid/-/hexoid-2.0.0.tgz",
@@ -12892,6 +12931,15 @@
       "funding": {
         "url": "https://github.com/sponsors/sindresorhus"
       }
+    },
+    "node_modules/zod": {
+      "version": "4.4.3",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-4.4.3.tgz",
+      "integrity": "sha512-ytENFjIJFl2UwYglde2jchW2Hwm4GJFLDiSXWdTrJQBIN9Fcyp7n4DhxJEiWNAJMV1/BqWfW/kkg71UDcHJyTQ==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/colinhacks"
+      }
     }
   }
 }
diff --git a/backend/package.json b/backend/package.json
index 359acc0..45a540c 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -36,7 +36,7 @@
     "@nestjs/serve-static": "^5.0.3",
     "@nestjs/swagger": "^11.2.0",
     "@nestjs/terminus": "^11.0.0",
-    "@nestjs/typeorm": "^11.0.0",
+    "@nestjs/typeorm": "^11.0.3",
     "@nestjs/websockets": "^11.0.10",
     "aws-sdk": "^2.1692.0",
     "axios": "^1.0.0",