diff --git a/functions/package-lock.json b/functions/package-lock.json
index d16e7e6..139cb76 100644
--- a/functions/package-lock.json
+++ b/functions/package-lock.json
@@ -2120,6 +2120,20 @@
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     },
+    "httpntlm": {
+      "version": "1.6.1",
+      "resolved": "https://registry.npmjs.org/httpntlm/-/httpntlm-1.6.1.tgz",
+      "integrity": "sha1-rQFScUOi6Hc8+uapb1hla7UqNLI=",
+      "requires": {
+        "httpreq": ">=0.4.22",
+        "underscore": "~1.7.0"
+      }
+    },
+    "httpreq": {
+      "version": "0.4.24",
+      "resolved": "https://registry.npmjs.org/httpreq/-/httpreq-0.4.24.tgz",
+      "integrity": "sha1-QzX/2CzZaWaKOUZckprGHWOTYn8="
+    },
     "https-proxy-agent": {
       "version": "2.2.1",
       "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-2.2.1.tgz",
@@ -2609,9 +2623,37 @@
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     },
     "nodemailer": {
-      "version": "6.1.1",
-      "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-6.1.1.tgz",
-      "integrity": "sha512-/x5MRIh56VyuuhLfcz+DL2SlBARpZpgQIf2A4Ao4hMb69MHSgDIMPwYmFwesGT1lkRDZ0eBSoym5+JoIZ3N+cQ=="
+      "version": "6.4.16",
+      "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-6.4.16.tgz",
+      "integrity": "sha512-68K0LgZ6hmZ7PVmwL78gzNdjpj5viqBdFqKrTtr9bZbJYj6BRj5W6WGkxXrEnUl3Co3CBXi3CZBUlpV/foGnOQ=="
+    },
+    "nodemailer-fetch": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/nodemailer-fetch/-/nodemailer-fetch-1.6.0.tgz",
+      "integrity": "sha1-ecSQihwPXzdbc/6IjamCj23JY6Q="
+    },
+    "nodemailer-shared": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/nodemailer-shared/-/nodemailer-shared-1.1.0.tgz",
+      "integrity": "sha1-z1mU4v0mjQD1zw+nZ6CBae2wfsA=",
+      "requires": {
+        "nodemailer-fetch": "1.6.0"
+      }
+    },
+    "nodemailer-smtp-transport": {
+      "version": "2.7.4",
+      "resolved": "https://registry.npmjs.org/nodemailer-smtp-transport/-/nodemailer-smtp-transport-2.7.4.tgz",
+      "integrity": "sha1-DYmvAZoUSkgP2OzJmZfZ+DjxNoU=",
+      "requires": {
+        "nodemailer-shared": "1.1.0",
+        "nodemailer-wellknown": "0.1.10",
+        "smtp-connection": "2.12.0"
+      }
+    },
+    "nodemailer-wellknown": {
+      "version": "0.1.10",
+      "resolved": "https://registry.npmjs.org/nodemailer-wellknown/-/nodemailer-wellknown-0.1.10.tgz",
+      "integrity": "sha1-WG24EB2zDLRDjrVGc3pBqtDPE9U="
     },
     "number-is-nan": {
       "version": "1.0.1",
@@ -3071,6 +3113,15 @@
         }
       }
     },
+    "smtp-connection": {
+      "version": "2.12.0",
+      "resolved": "https://registry.npmjs.org/smtp-connection/-/smtp-connection-2.12.0.tgz",
+      "integrity": "sha1-1275EnyyPCJZ7bHoNJwujV4tdME=",
+      "requires": {
+        "httpntlm": "1.6.1",
+        "nodemailer-shared": "1.1.0"
+      }
+    },
     "snakeize": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/snakeize/-/snakeize-0.1.0.tgz",
@@ -3297,6 +3348,11 @@
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
       "optional": true
     },
+    "underscore": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.7.0.tgz",
+      "integrity": "sha1-a7rwh3UA02vjTsqlhODbn+8DUgk="
+    },
     "unique-string": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unique-string/-/unique-string-1.0.0.tgz",
diff --git a/functions/package.json b/functions/package.json
index 4448248..1511e3f 100644
--- a/functions/package.json
+++ b/functions/package.json
@@ -15,7 +15,7 @@
   "dependencies": {
     "firebase-admin": "~7.0.0",
     "firebase-functions": "^2.2.0",
-    "nodemailer": "^6.1.1",
+    "nodemailer": "^6.4.16",
     "nodemailer-smtp-transport": "^2.7.4"
   },
   "devDependencies": {