diff --git a/functions/package-lock.json b/functions/package-lock.json
index fa8e3bf..f2bf729 100644
--- a/functions/package-lock.json
+++ b/functions/package-lock.json
@@ -2915,9 +2915,9 @@
       "integrity": "sha512-t1V2RFiaTavaW3jtQO0A2nok6k7/Gghuvx2rjvICuT0B0dYaObBQ4U0xHL+ZTPFZodt1LMYG2Vi2nypfz4/AJg=="
     },
     "nodemailer": {
-      "version": "6.0.0",
-      "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-6.0.0.tgz",
-      "integrity": "sha512-PMQJyLhoNAMoBU1hEh5aaUkpa/tcDNwzS7s7zow/myKfoEoZewMxUuWZqQ5yjYsAnvE484KSkYH5s6iPvcjhCg=="
+      "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/functions/package.json b/functions/package.json
index 01b5065..f106107 100644
--- a/functions/package.json
+++ b/functions/package.json
@@ -14,7 +14,7 @@
     "express": "^4.16.3",
     "firebase-admin": "^7.2.0",
     "firebase-functions": "^2.2.1",
-    "nodemailer": "^6.0.0"
+    "nodemailer": "^6.4.16"
   },
   "engines": {
     "node": "8"