diff --git a/README.md b/README.md
index 51d4bc5..6b43616 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # is-regular-file
 
-[![NPM version][npm-image]][npm-url] [![Downloads][downloads-image]][npm-url] [![Build Status][travis-image]][travis-url] [![Coverage Status][coveralls-image]][coveralls-url] [![Dependency status][david-dm-image]][david-dm-url] [![Dev Dependency status][david-dm-dev-image]][david-dm-dev-url]
+[![NPM version][npm-image]][npm-url] [![Downloads][downloads-image]][npm-url] [![Build Status][travis-image]][travis-url] [![Coverage Status][coveralls-image]][coveralls-url] [![Dependency status][david-dm-image]][david-dm-url] [![Dev Dependency status][david-dm-dev-image]][david-dm-dev-url] [![Greenkeeper badge][greenkeeper-image]][greenkeeper-url]
 
 [npm-url]:https://npmjs.org/package/is-regular-file
 [downloads-image]:http://img.shields.io/npm/dm/is-regular-file.svg
@@ -13,6 +13,8 @@
 [david-dm-image]:https://img.shields.io/david/IndigoUnited/node-is-regular-file.svg
 [david-dm-dev-url]:https://david-dm.org/IndigoUnited/node-is-regular-file?type=dev
 [david-dm-dev-image]:https://img.shields.io/david/dev/IndigoUnited/node-is-regular-file.svg
+[greenkeeper-image]:https://badges.greenkeeper.io/IndigoUnited/node-is-regular-file.svg
+[greenkeeper-url]:https://greenkeeper.io/
 
 Checks if a path is a regular file.
 
diff --git a/package.json b/package.json
index 44aa523..ae89165 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
   "devDependencies": {
     "@satazor/eslint-config": "^3.0.0",
     "betray": "^1.3.0",
-    "chai": "^3.5.0",
+    "chai": "^4.0.2",
     "coveralls": "^2.11.9",
     "eslint": "^3.0.0",
     "istanbul": "^0.4.3",