diff --git a/package.json b/package.json
index d61bb2e..3986fb0 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     "lodash": "^4.17.4",
     "moment": "^2.19.3",
     "node-schedule": "^1.2.5",
-    "nodemailer": "^4.4.0",
+    "nodemailer": "^6.6.1",
     "nodemailer-sendgrid-transport": "^0.2.0",
     "probot": "^0.11.0"
   },
diff --git a/yarn.lock b/yarn.lock
index 3c9cb5f..b23dc51 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4256,9 +4256,9 @@ nodemailer-sendgrid-transport@^0.2.0:
   dependencies:
     sendgrid "^1.8.0"
 
-nodemailer@^4.4.0:
-  version "4.4.0"
-  resolved "https://registry.yarnpkg.com/nodemailer/-/nodemailer-4.4.0.tgz#571989e524a906fb83b1518f3e4c0d3140db24af"
+nodemailer@^6.6.1:
+  version "6.6.1"
+  resolved "https://registry.yarnpkg.com/nodemailer/-/nodemailer-6.6.1.tgz#2a05fbf205b897d71bf43884167b5d4d3bd01b99"
 
 nopt@^4.0.1:
   version "4.0.1"