diff --git a/README.md b/README.md
index 6cb9087..83c3a72 100644
--- a/README.md
+++ b/README.md
@@ -14,3 +14,6 @@ See [docs](https://aureooms.github.io/js-integer-sequences/index.html).
 [![NPM downloads per month](https://img.shields.io/npm/dm/@aureooms/js-integer-sequences.svg?style=flat)](https://www.npmjs.org/package/@aureooms/js-integer-sequences)
 [![GitHub issues](https://img.shields.io/github/issues/aureooms/js-integer-sequences.svg?style=flat)](https://github.com/aureooms/js-integer-sequences/issues)
 [![Documentation](https://aureooms.github.io/js-integer-sequences/badge.svg)](https://aureooms.github.io/js-integer-sequences/source.html)
+
+
+[![Greenkeeper badge](https://badges.greenkeeper.io/aureooms/js-integer-sequences.svg)](https://greenkeeper.io/)
\ No newline at end of file
diff --git a/package.json b/package.json
index 1c926a6..178a94a 100644
--- a/package.json
+++ b/package.json
@@ -24,14 +24,14 @@
   },
   "dependencies": {},
   "devDependencies": {
-    "ava": "^0.16.0",
+    "ava": "^0.19.1",
     "babel-cli": "^6.18.0",
     "babel-polyfill": "^6.16.0",
     "babel-preset-latest": "^6.16.0",
     "codeclimate-test-reporter": "^0.4.0",
     "coveralls": "^2.11.14",
-    "esdoc": "^0.4.8",
-    "nyc": "^8.4.0"
+    "esdoc": "^0.5.2",
+    "nyc": "^10.2.0"
   },
   "homepage": "https://aureooms.github.io/js-integer-sequences",
   "keywords": ["computer-science", "integer-sequences", "mathematics"],