diff --git a/Chapter 04/emailing/package.json b/Chapter 04/emailing/package.json
index 7e4ad6b..3f5d167 100644
--- a/Chapter 04/emailing/package.json	
+++ b/Chapter 04/emailing/package.json	
@@ -23,6 +23,6 @@
   "dependencies": {
     "mandrill-api": "^1.0.45",
     "nodemailer": "^1.10.0",
-    "seneca": "^0.8.0"
+    "seneca": "^3.17.0"
   }
 }