diff --git a/backend/package.json b/backend/package.json
index 611b0fc..d107f51 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -27,7 +27,7 @@
     "jsonwebtoken": "^9.0.3",
     "mongoose": "^8.3.1",
     "multer": "^2.1.1",
-    "nodemailer": "^8.0.4",
+    "nodemailer": "^9.0.1",
     "papaparse": "^5.5.3",
     "rrule": "^2.8.1",
     "zod": "^4.1.12"
diff --git a/backend/pnpm-lock.yaml b/backend/pnpm-lock.yaml
index 591001c..d0e8af6 100644
--- a/backend/pnpm-lock.yaml
+++ b/backend/pnpm-lock.yaml
@@ -45,8 +45,8 @@ importers:
         specifier: ^2.1.1
         version: 2.1.1
       nodemailer:
-        specifier: ^8.0.4
-        version: 8.0.4
+        specifier: ^9.0.1
+        version: 9.0.1
       papaparse:
         specifier: ^5.5.3
         version: 5.5.3
@@ -1587,8 +1587,8 @@ packages:
     resolution: {integrity: sha512-LA4ZjwlnUblHVgq0oBF3Jl/6h/Nvs5fzBLwdEF4nuxnFdsfajde4WfxtJr3CaiH+F6ewcIB/q4jQ4UzPyid+CQ==}
     hasBin: true
 
-  nodemailer@8.0.4:
-    resolution: {integrity: sha512-k+jf6N8PfQJ0Fe8ZhJlgqU5qJU44Lpvp2yvidH3vp1lPnVQMgi4yEEMPXg5eJS1gFIJTVq1NHBk7Ia9ARdSBdQ==}
+  nodemailer@9.0.1:
+    resolution: {integrity: sha512-Gwv8SQewT616ZM/URn0H54b8PWo/Wum7md3EW2aWy1lO27+WZCX+Xyak3J+NlmHUjDh5ME+uesJUDRbR3Ye8Bw==}
     engines: {node: '>=6.0.0'}
 
   nodemon@3.1.9:
@@ -3876,7 +3876,7 @@ snapshots:
 
   node-gyp-build@4.8.4: {}
 
-  nodemailer@8.0.4: {}
+  nodemailer@9.0.1: {}
 
   nodemon@3.1.9:
     dependencies: