diff --git a/README.md b/README.md
index 1f59762..9f480dc 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # MarkerClustererPlus
 
+[![Greenkeeper badge](https://badges.greenkeeper.io/mahnunchik/markerclustererplus.svg)](https://greenkeeper.io/)
+
 ## Warning!
 
 The following files have been deprecated and will be removed in the next release:
diff --git a/package.json b/package.json
index 1d92b97..84213d2 100644
--- a/package.json
+++ b/package.json
@@ -20,6 +20,6 @@
   "license": "Apache-2.0",
   "dependencies": {},
   "devDependencies": {
-    "uglify-js": "^2.4.17"
+    "uglify-js": "^3.0.4"
   }
 }