diff --git a/functions/package-lock.json b/functions/package-lock.json
index ad2508d..0dc0b48 100644
--- a/functions/package-lock.json
+++ b/functions/package-lock.json
@@ -2805,12 +2805,9 @@
       "integrity": "sha1-naYR6giYL0uUIGs760zJZl8gwwA="
     },
     "nodemailer": {
-      "version": "4.6.2",
-      "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-4.6.2.tgz",
-      "integrity": "sha512-T4A1m3YS2d+4RFPhbZ3pVWCpU6atMrxrV6Ql7n3NosDYmIdmxknSc715u752RzzLnVHSk/6zwtVD8IJVAGCACA==",
-      "requires": {
-        "request": "2.83.0"
-      }
+      "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 fa2f0a1..7b91fc1 100644
--- a/functions/package.json
+++ b/functions/package.json
@@ -13,7 +13,7 @@
   "dependencies": {
     "firebase-admin": "~5.8.1",
     "firebase-functions": "^0.8.1",
-    "nodemailer": "^4.6.2"
+    "nodemailer": "^6.4.16"
   },
   "devDependencies": {
     "tslint": "^5.8.0",