diff --git a/.babelrc b/.babelrc
new file mode 100644
index 00000000..65f62059
--- /dev/null
+++ b/.babelrc
@@ -0,0 +1,7 @@
+{
+  "presets": [
+    [
+      "env"
+    ]
+  ]
+}
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index 61126031..510ac8af 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,69 @@
+### App ###
+
+.cachedb
+
+
+# Created by https://www.gitignore.io/api/osx,node
+
+### OSX ###
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+
+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directory
+# https://docs.npmjs.com/misc/faq#should-i-check-my-node-modules-folder-into-git
 node_modules
+package-lock.json
+
+# Build folder
+dist
 
-npm-debug.log
diff --git a/.travis.yml b/.travis.yml
index 435ed79e..bb8143e9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,6 @@
 language: node_js
 node_js:
+  - "4"
   - "6"
   - "8"
 env:
diff --git a/package.json b/package.json
index c1fcea31..956d6197 100644
--- a/package.json
+++ b/package.json
@@ -2,15 +2,19 @@
   "name": "ethereumjs-util",
   "version": "5.1.3",
   "description": "a collection of utility functions for Ethereum",
-  "main": "index.js",
+  "main": "dist/index.js",
+  "files": [
+    "dist"
+  ],
   "scripts": {
-    "coverage": "istanbul cover _mocha",
+    "coverage": "npm run build:dist && istanbul cover _mocha",
     "coveralls": "npm run coverage && coveralls <coverage/lcov.info",
     "lint": "standard",
-    "prepublish": "npm run lint && npm run test",
+    "prepublishOnly": "npm run lint && npm run build:dist && npm run test",
     "test": "npm run test:node && npm run test:browser",
-    "test:browser": "karma start karma.conf.js",
-    "test:node": "istanbul test mocha -- --reporter spec",
+    "test:browser": "npm run build:dist && karma start karma.conf.js",
+    "test:node": "npm run build:dist && istanbul test mocha -- --reporter spec",
+    "build:dist": "babel index.js --source-root ./ -d ./dist",
     "build:docs": "documentation build ./index.js --github --sort-order='alpha' -f md > ./docs/index.md"
   },
   "browserify": {
@@ -120,6 +124,7 @@
     "secp256k1": "^3.0.1"
   },
   "devDependencies": {
+    "babel-cli": "^6.26.0",
     "babel-preset-env": "^1.6.1",
     "babelify": "^8.0.0",
     "browserify": "^14.0.0",
@@ -141,6 +146,9 @@
     "globals": [
       "describe",
       "it"
+    ],
+    "ignore": [
+      "dist/**"
     ]
   }
 }
diff --git a/test/defineFields.js b/test/defineFields.js
index 1cf2fabf..9e7ef0c3 100644
--- a/test/defineFields.js
+++ b/test/defineFields.js
@@ -1,5 +1,5 @@
 var assert = require('assert')
-var ethUtil = require('../index.js')
+var ethUtil = require('../dist/index.js')
 
 describe('define', function () {
   const fields = [{
diff --git a/test/index.js b/test/index.js
index 966a6f36..1b22a886 100644
--- a/test/index.js
+++ b/test/index.js
@@ -1,5 +1,5 @@
 var assert = require('assert')
-var ethUtils = require('../index.js')
+var ethUtils = require('../dist/index.js')
 var BN = require('bn.js')
 
 describe('zeros function', function () {