diff --git a/sample/01-complete-app/package-lock.json b/sample/01-complete-app/package-lock.json
index 8254351..a4ad53c 100644
--- a/sample/01-complete-app/package-lock.json
+++ b/sample/01-complete-app/package-lock.json
@@ -12,7 +12,7 @@
         "@nestjs/common": "7.6.15",
         "@nestjs/core": "7.6.15",
         "@nestjs/platform-express": "7.6.15",
-        "dotenv": "8.2.0",
+        "dotenv": "9.0.2",
         "nestjs-telegraf": "2.2.2",
         "reflect-metadata": "0.1.13",
         "rimraf": "3.0.2",
@@ -4135,11 +4135,11 @@
       }
     },
     "node_modules/dotenv": {
-      "version": "8.2.0",
-      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-8.2.0.tgz",
-      "integrity": "sha512-8sJ78ElpbDJBHNeBzUbUVLsqKdccaa/BXF1uPTw3GrvQTBgrQrtObr2mUrE38vzYd8cEv+m/JBfDLioYcfXoaw==",
+      "version": "9.0.2",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-9.0.2.tgz",
+      "integrity": "sha512-I9OvvrHp4pIARv4+x9iuewrWycX6CcZtoAu1XrzPxc5UygMJXJZYmBsynku8IkrJwgypE5DGNjDPmPRhDCptUg==",
       "engines": {
-        "node": ">=8"
+        "node": ">=10"
       }
     },
     "node_modules/ecc-jsbn": {
@@ -15970,9 +15970,9 @@
       }
     },
     "dotenv": {
-      "version": "8.2.0",
-      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-8.2.0.tgz",
-      "integrity": "sha512-8sJ78ElpbDJBHNeBzUbUVLsqKdccaa/BXF1uPTw3GrvQTBgrQrtObr2mUrE38vzYd8cEv+m/JBfDLioYcfXoaw=="
+      "version": "9.0.2",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-9.0.2.tgz",
+      "integrity": "sha512-I9OvvrHp4pIARv4+x9iuewrWycX6CcZtoAu1XrzPxc5UygMJXJZYmBsynku8IkrJwgypE5DGNjDPmPRhDCptUg=="
     },
     "ecc-jsbn": {
       "version": "0.1.2",
diff --git a/sample/01-complete-app/package.json b/sample/01-complete-app/package.json
index bd0028c..1db3137 100644
--- a/sample/01-complete-app/package.json
+++ b/sample/01-complete-app/package.json
@@ -23,7 +23,7 @@
     "@nestjs/common": "7.6.15",
     "@nestjs/core": "7.6.15",
     "@nestjs/platform-express": "7.6.15",
-    "dotenv": "8.2.0",
+    "dotenv": "9.0.2",
     "nestjs-telegraf": "2.2.2",
     "reflect-metadata": "0.1.13",
     "rimraf": "3.0.2",