diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..d485320
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,15 @@
+language: node_js
+cache: yarn
+node_js:
+  - "node"
+  - "7"
+  - "6"
+  - "5"
+  - "4"
+  - "0.12.0"
+  - "0.11.0"
+  - "0.10.0"
+  - "iojs"
+  - "iojs-3"
+  - "iojs-2"
+  - "iojs-1.0.0"
diff --git a/README.md b/README.md
index 7002224..cf84f70 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,10 @@ Deep Extend
 
 Recursive object extending.
 
+[![Build Status](https://api.travis-ci.org/unclechu/node-deep-extend.svg?branch=master)](https://travis-ci.org/unclechu/node-deep-extend)
+
 [![NPM](https://nodei.co/npm/deep-extend.png?downloads=true&downloadRank=true&stars=true)](https://nodei.co/npm/deep-extend/)
+
 [![NPM](https://nodei.co/npm-dl/deep-extend.png?height=3)](https://nodei.co/npm/deep-extend/)
 
 Install
diff --git a/package.json b/package.json
index a6dfab5..aaea687 100644
--- a/package.json
+++ b/package.json
@@ -42,15 +42,15 @@
   ],
   "main": "lib/deep-extend.js",
   "engines": {
-    "node": ">=0.12.0",
+    "node": ">=0.10.0",
     "iojs": ">=1.0.0"
   },
   "scripts": {
     "test": "./node_modules/.bin/mocha"
   },
   "devDependencies": {
-    "mocha": "^2.2.1",
-    "should": "^5.2.0"
+    "mocha": "2.2.1",
+    "should": "5.2.0"
   },
   "directories": {
     "lib": "./lib/",
diff --git a/yarn.lock b/yarn.lock
new file mode 100644
index 0000000..9c10681
--- /dev/null
+++ b/yarn.lock
@@ -0,0 +1,127 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+commander@0.6.1:
+  version "0.6.1"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-0.6.1.tgz#fa68a14f6a945d54dbbe50d8cdb3320e9e3b1a06"
+
+commander@2.3.0:
+  version "2.3.0"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-2.3.0.tgz#fd430e889832ec353b9acd1de217c11cb3eef873"
+
+debug@2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-2.2.0.tgz#f87057e995b1a1f6ae6a4960664137bc56f039da"
+  dependencies:
+    ms "0.7.1"
+
+diff@1.4.0:
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/diff/-/diff-1.4.0.tgz#7f28d2eb9ee7b15a97efd89ce63dcfdaa3ccbabf"
+
+escape-string-regexp@1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-1.0.2.tgz#4dbc2fe674e71949caf3fb2695ce7f2dc1d9a8d1"
+
+glob@3.2.11:
+  version "3.2.11"
+  resolved "https://registry.yarnpkg.com/glob/-/glob-3.2.11.tgz#4a973f635b9190f715d10987d5c00fd2815ebe3d"
+  dependencies:
+    inherits "2"
+    minimatch "0.3"
+
+growl@1.9.2:
+  version "1.9.2"
+  resolved "https://registry.yarnpkg.com/growl/-/growl-1.9.2.tgz#0ea7743715db8d8de2c5ede1775e1b45ac85c02f"
+
+inherits@2:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.3.tgz#633c2c83e3da42a502f52466022480f4208261de"
+
+jade@0.26.3:
+  version "0.26.3"
+  resolved "https://registry.yarnpkg.com/jade/-/jade-0.26.3.tgz#8f10d7977d8d79f2f6ff862a81b0513ccb25686c"
+  dependencies:
+    commander "0.6.1"
+    mkdirp "0.3.0"
+
+lru-cache@2:
+  version "2.7.3"
+  resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-2.7.3.tgz#6d4524e8b955f95d4f5b58851ce21dd72fb4e952"
+
+minimatch@0.3:
+  version "0.3.0"
+  resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-0.3.0.tgz#275d8edaac4f1bb3326472089e7949c8394699dd"
+  dependencies:
+    lru-cache "2"
+    sigmund "~1.0.0"
+
+minimist@0.0.8:
+  version "0.0.8"
+  resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
+
+mkdirp@0.3.0:
+  version "0.3.0"
+  resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-0.3.0.tgz#1bbf5ab1ba827af23575143490426455f481fe1e"
+
+mkdirp@0.5.1:
+  version "0.5.1"
+  resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
+  dependencies:
+    minimist "0.0.8"
+
+mocha@^2.2.1:
+  version "2.5.3"
+  resolved "https://registry.yarnpkg.com/mocha/-/mocha-2.5.3.tgz#161be5bdeb496771eb9b35745050b622b5aefc58"
+  dependencies:
+    commander "2.3.0"
+    debug "2.2.0"
+    diff "1.4.0"
+    escape-string-regexp "1.0.2"
+    glob "3.2.11"
+    growl "1.9.2"
+    jade "0.26.3"
+    mkdirp "0.5.1"
+    supports-color "1.2.0"
+    to-iso-string "0.0.2"
+
+ms@0.7.1:
+  version "0.7.1"
+  resolved "https://registry.yarnpkg.com/ms/-/ms-0.7.1.tgz#9cd13c03adbff25b65effde7ce864ee952017098"
+
+should-equal@0.3.1:
+  version "0.3.1"
+  resolved "https://registry.yarnpkg.com/should-equal/-/should-equal-0.3.1.tgz#bd8ea97a6748e39fad476a3be6fd72ebc2e72bf0"
+  dependencies:
+    should-type "0.0.4"
+
+should-format@0.0.7:
+  version "0.0.7"
+  resolved "https://registry.yarnpkg.com/should-format/-/should-format-0.0.7.tgz#1e2ef86bd91da9c2e0412335b56ababd9a2fde12"
+  dependencies:
+    should-type "0.0.4"
+
+should-type@0.0.4:
+  version "0.0.4"
+  resolved "https://registry.yarnpkg.com/should-type/-/should-type-0.0.4.tgz#0132a05417a6126866426acf116f1ed5623a5cd0"
+
+should@^5.2.0:
+  version "5.2.0"
+  resolved "https://registry.yarnpkg.com/should/-/should-5.2.0.tgz#9a4519b447b8b5eedce9eed96af3420d451a540b"
+  dependencies:
+    should-equal "0.3.1"
+    should-format "0.0.7"
+    should-type "0.0.4"
+
+sigmund@~1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/sigmund/-/sigmund-1.0.1.tgz#3ff21f198cad2175f9f3b781853fd94d0d19b590"
+
+supports-color@1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-1.2.0.tgz#ff1ed1e61169d06b3cf2d588e188b18d8847e17e"
+
+to-iso-string@0.0.2:
+  version "0.0.2"
+  resolved "https://registry.yarnpkg.com/to-iso-string/-/to-iso-string-0.0.2.tgz#4dc19e664dfccbe25bd8db508b00c6da158255d1"