diff --git a/functions/package-lock.json b/functions/package-lock.json
index b75f2bc..2c33bb6 100644
--- a/functions/package-lock.json
+++ b/functions/package-lock.json
@@ -15,7 +15,7 @@
         "firebase-admin": "~13.6.0",
         "firebase-functions": "^3.24.1",
         "libphonenumber-js": "^1.7.20",
-        "nodemailer": "^6.3.0",
+        "nodemailer": "^8.0.9",
         "ogp-parser": "^0.8.1",
         "sharp": "^0.32.6",
         "stripe": "^7.3.0",
@@ -4864,9 +4864,9 @@
       }
     },
     "node_modules/nodemailer": {
-      "version": "6.9.7",
-      "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-6.9.7.tgz",
-      "integrity": "sha512-rUtR77ksqex/eZRLmQ21LKVH5nAAsVicAtAYudK7JgwenEDZ0UIQ1adUGqErz7sMkWYxWTTU1aeP2Jga6WQyJw==",
+      "version": "8.0.9",
+      "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-8.0.9.tgz",
+      "integrity": "sha512-5ofa7BUN8+C+Hckh5V2GjeeOGRQBx0CJQA6KxrvuZfC8iU4/q7sLn8XrtEEhJkjV6HdyIiQs7Bba6bTao8JhkA==",
       "engines": {
         "node": ">=6.0.0"
       }
@@ -10520,9 +10520,9 @@
       "integrity": "sha512-6xKiQ+cph9KImrRh0VsjH2d8/GXA4FIMlgU4B757iI1ApvcyA9VlouP0yZJha01V+huImO+kKMU7ih+2+E14fw=="
     },
     "nodemailer": {
-      "version": "6.9.7",
-      "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-6.9.7.tgz",
-      "integrity": "sha512-rUtR77ksqex/eZRLmQ21LKVH5nAAsVicAtAYudK7JgwenEDZ0UIQ1adUGqErz7sMkWYxWTTU1aeP2Jga6WQyJw=="
+      "version": "8.0.9",
+      "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-8.0.9.tgz",
+      "integrity": "sha512-5ofa7BUN8+C+Hckh5V2GjeeOGRQBx0CJQA6KxrvuZfC8iU4/q7sLn8XrtEEhJkjV6HdyIiQs7Bba6bTao8JhkA=="
     },
     "nth-check": {
       "version": "2.1.1",
diff --git a/functions/package.json b/functions/package.json
index 11e490d..ee67809 100644
--- a/functions/package.json
+++ b/functions/package.json
@@ -36,7 +36,7 @@
     "firebase-admin": "~13.6.0",
     "firebase-functions": "^3.24.1",
     "libphonenumber-js": "^1.7.20",
-    "nodemailer": "^6.3.0",
+    "nodemailer": "^8.0.9",
     "ogp-parser": "^0.8.1",
     "sharp": "^0.32.6",
     "stripe": "^7.3.0",