diff --git a/.npmignore b/.npmignore
new file mode 100644
index 000000000..61b58ad44
--- /dev/null
+++ b/.npmignore
@@ -0,0 +1,20 @@
+*.swp
+coverage
+node_modules
+browser/tests.js
+docs/api
+
+CONTRIBUTING.html
+LICENSE.html
+README.html
+examples.html
+npm-debug.log
+
+apiref
+bower_components
+report
+.DS_Store
+
+build
+
+tests.js
diff --git a/README.md b/README.md
index e7755def8..b3fc13ba5 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ Infrastructure to build Bitcoin and blockchain-based applications for the next g
 
 ## Getting Started
 
-Before you begin you'll need to have Node.js v4 or v0.12 installed. There are several options for installation. One method is to use [nvm](https://github.com/creationix/nvm) to easily switch between different versions, or download directly from [Node.js](https://nodejs.org/).
+Before you begin you'll need to have Node.js v8 installed. There are several options for installation. One method is to use [nvm](https://github.com/creationix/nvm) to easily switch between different versions, or download directly from [Node.js](https://nodejs.org/).
 
 ```bash
 npm install -g bitcore
@@ -78,7 +78,6 @@ This will generate files named `bitcore.js` and `bitcore.min.js`.
 You can also use our pre-generated files, provided for each release along with a PGP signature by one of the project's maintainers. To get them, checkout a release commit (for example, https://github.com/bitpay/bitcore/commit/e33b6e3ba6a1e5830a079e02d949fce69ea33546 for v0.12.6).
 
 To verify signatures, use the following PGP keys:
-- @braydonf: https://pgp.mit.edu/pks/lookup?op=get&search=0x9BBF07CAC07A276D `D909 EFE6 70B5 F6CC 89A3 607A 9BBF 07CA C07A 276D`
 - @gabegattis: https://pgp.mit.edu/pks/lookup?op=get&search=0x441430987182732C `F3EA 8E28 29B4 EC93 88CB  B0AA 4414 3098 7182 732C`
 - @kleetus: https://pgp.mit.edu/pks/lookup?op=get&search=0x33195D27EF6BDB7F `F8B0 891C C459 C197 65C2 5043 3319 5D27 EF6B DB7F`
 - @matiu: https://pgp.mit.edu/pks/lookup?op=get&search=0x9EDE6DE4DE531FAC `25CE ED88 A1B1 0CD1 12CD  4121 9EDE 6DE4 DE53 1FAC`
@@ -87,4 +86,4 @@ To verify signatures, use the following PGP keys:
 
 Code released under [the MIT license](https://github.com/bitpay/bitcore/blob/master/LICENSE).
 
-Copyright 2013-2015 BitPay, Inc. Bitcore is a trademark maintained by BitPay, Inc.
+Copyright 2013-2017 BitPay, Inc. Bitcore is a trademark maintained by BitPay, Inc.
diff --git a/bin/bitcore b/bin/bitcore
index cfaa8abd0..631d2ce76 100755
--- a/bin/bitcore
+++ b/bin/bitcore
@@ -1,5 +1,9 @@
 #!/usr/bin/env node
 
+if (parseInt(process.version.split('.')[0].slice(1)) < 8) {
+  throw new Error('Bitcore requires Node version 8 or higher.');
+}
+
 var bitcore = require('bitcore-node/lib/cli/bitcore');
 var path = require('path');
 var servicesPath = path.resolve(__dirname, '../');
diff --git a/bin/bitcored b/bin/bitcored
index 257c1ecf6..0e4dc14db 100755
--- a/bin/bitcored
+++ b/bin/bitcored
@@ -2,6 +2,10 @@
 
 'use strict';
 
+if (parseInt(process.version.split('.')[0].slice(1)) < 8) {
+  throw new Error('Bitcore requires Node version 8 or higher.');
+}
+
 var path = require('path');
 var bitcored = require('bitcore-node/lib/cli/bitcored');
 var servicesPath = path.resolve(__dirname, '../');
diff --git a/package-lock.json b/package-lock.json
index 2612e3fdd..92fa5d4a1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "bitcore",
-  "version": "5.0.0-beta.3",
+  "version": "5.0.0-beta.4",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index ad5350263..5ded783a3 100644
--- a/package.json
+++ b/package.json
@@ -2,6 +2,9 @@
   "name": "bitcore",
   "version": "5.0.0-beta.4",
   "description": "A platform to build bitcoin and blockchain-based applications.",
+  "engines": {
+    "node": ">=8.0.0"
+  },
   "author": "BitPay <dev@bitpay.com>",
   "main": "index.js",
   "scripts": {