diff --git a/README.md b/README.md
index 060f83719..4f75ab075 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,7 @@ The fastest JSON Schema validator for node.js and browser with draft 6 support.
 [![npm downloads](https://img.shields.io/npm/dm/ajv.svg)](https://www.npmjs.com/package/ajv)
 [![Code Climate](https://codeclimate.com/github/epoberezkin/ajv/badges/gpa.svg)](https://codeclimate.com/github/epoberezkin/ajv)
 [![Coverage Status](https://coveralls.io/repos/epoberezkin/ajv/badge.svg?branch=master&service=github)](https://coveralls.io/github/epoberezkin/ajv?branch=master)
+[![Greenkeeper badge](https://badges.greenkeeper.io/epoberezkin/ajv.svg)](https://greenkeeper.io/)
 [![Gitter](https://img.shields.io/gitter/room/ajv-validator/ajv.svg)](https://gitter.im/ajv-validator/ajv)
 
 
diff --git a/package.json b/package.json
index d62a96111..25f8ec253 100644
--- a/package.json
+++ b/package.json
@@ -93,7 +93,7 @@
     "regenerator": "0.9.7",
     "require-globify": "^1.3.0",
     "typescript": "^2.0.3",
-    "uglify-js": "2.6.1",
+    "uglify-js": "^2.6.1",
     "watch": "^1.0.0"
   }
 }