diff --git a/demo5/functions/package-lock.json b/demo5/functions/package-lock.json
index 7366e8c..2b9f3ed 100644
--- a/demo5/functions/package-lock.json
+++ b/demo5/functions/package-lock.json
@@ -2946,9 +2946,9 @@
       "integrity": "sha512-8Df0906+tq/omxuCZD6PqhPaQDYuyJ1d+VITgxoIA8zvQd1ru+nMJcDChHH324MWitIgbVkAkQoGEEVJNpn/PA=="
     },
     "nodemailer": {
-      "version": "5.1.1",
-      "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-5.1.1.tgz",
-      "integrity": "sha512-hKGCoeNdFL2W7S76J/Oucbw0/qRlfG815tENdhzcqTpSjKgAN91mFOqU2lQUflRRxFM7iZvCyaFcAR9noc/CqQ=="
+      "version": "6.4.16",
+      "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-6.4.16.tgz",
+      "integrity": "sha512-68K0LgZ6hmZ7PVmwL78gzNdjpj5viqBdFqKrTtr9bZbJYj6BRj5W6WGkxXrEnUl3Co3CBXi3CZBUlpV/foGnOQ=="
     },
     "number-is-nan": {
       "version": "1.0.1",
diff --git a/demo5/functions/package.json b/demo5/functions/package.json
index 5362bcb..fdc7c4f 100644
--- a/demo5/functions/package.json
+++ b/demo5/functions/package.json
@@ -13,7 +13,7 @@
     "cors": "^2.8.5",
     "firebase-admin": "~7.0.0",
     "firebase-functions": "^2.3.1",
-    "nodemailer": "^5.1.1"
+    "nodemailer": "^6.4.16"
   },
   "devDependencies": {
     "eslint": "^5.16.0",