diff --git a/package.json b/package.json
index 44512b6..54da635 100644
--- a/package.json
+++ b/package.json
@@ -39,5 +39,10 @@
     "mocha": "^3.2.0",
     "sinon": "^1.17.4",
     "supertest": "^3.0.0"
+  },
+  "greenkeeper": {
+    "ignore": [
+      "nodemailer"
+    ]
   }
 }