diff --git a/package.json b/package.json
index b86fa3e0..9c83d484 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@financial-times/n-heroku-tools",
-  "version": "6.3.0",
+  "version": "6.3.1",
   "bin": {
     "next-build-tools": "./bin/n-heroku-tools.js",
     "nbt": "./bin/n-heroku-tools.js",