diff --git a/README.md b/README.md
index e03785a..365ad6b 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 Btc Explorer API
 ======
 
+[![Greenkeeper badge](https://badges.greenkeeper.io/owstack/btc-explorer-api.svg)](https://greenkeeper.io/)
+
 [![NPM Package](https://img.shields.io/npm/v/btc-explorer-api.svg?style=flat-square)](https://www.npmjs.org/package/btc-explorer-api)
 [![Build Status](https://img.shields.io/travis/owstack/btc-explorer-api.svg?branch=master&style=flat-square)](https://travis-ci.org/owstack/btc-explorer-api)
 [![Coverage Status](https://img.shields.io/coveralls/owstack/btc-explorer-api.svg?style=flat-square)](https://coveralls.io/r/owstack/btc-explorer-api)
diff --git a/package.json b/package.json
index 2a951af..6c555f0 100644
--- a/package.json
+++ b/package.json
@@ -37,10 +37,10 @@
     "request": "^2.64.0"
   },
   "devDependencies": {
-    "chai": "^3.5.0",
-    "mocha": "^2.4.5",
+    "chai": "^4.1.2",
+    "mocha": "^4.0.0",
     "proxyquire": "^1.7.2",
-    "should": "^8.3.1",
-    "sinon": "^1.10.3"
+    "should": "^13.1.0",
+    "sinon": "^4.0.0"
   }
 }