diff --git a/.eslintignore b/.eslintignore
index 1ce4437ab5..7adc61c7f0 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -2,3 +2,4 @@ coverage/
 lib/to-iso-string/**/*.js
 mocha.js
 BUILDTMP
+*.fixture.js
diff --git a/.travis.yml b/.travis.yml
index f475c66b1f..7e849ccc35 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,18 +21,8 @@ matrix:
       env: TARGET=test-node
     - node_js: '6'
       env: TARGET=test-node
-    - node_js: '5'
-      env: TARGET=test-node
     - node_js: '4'
       env: TARGET=test-node
-    - node_js: 'iojs'
-      env: TARGET=test-node
-    - node_js: '0.12'
-      env: TARGET=test-node
-    - node_js: '0.11'
-      env: TARGET=test-node
-    - node_js: '0.10'
-      env: TARGET=test-node
     - node_js: '8'
       env: TARGET=lint
     # phantomjs
diff --git a/Makefile b/Makefile
index c31e59fabe..333086277d 100644
--- a/Makefile
+++ b/Makefile
@@ -77,11 +77,12 @@ test-compilers:
 	$(call test_node,compilers-coffee) --compilers coffee:coffee-script/register \
 		test/compiler
 
-	$(call test_node,compilers-custom) --compilers foo:./test/compiler-fixtures/foo \
+	$(call test_node,compilers-custom) \
+	--compilers foo:./test/compiler-fixtures/foo.fixture \
 		test/compiler
 
 	$(call test_node,compilers-multiple) \
-		--compilers coffee:coffee-script/register,foo:./test/compiler-fixtures/foo \
+		--compilers coffee:coffee-script/register,foo:./test/compiler-fixtures/foo.fixture \
 		test/compiler
 
 test-requires:
diff --git a/appveyor.yml b/appveyor.yml
index ff832db835..2fe1c21c65 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -4,8 +4,6 @@ environment:
     - nodejs_version: '7'
     - nodejs_version: '6'
     - nodejs_version: '4'
-    - nodejs_version: '0.12'
-    - nodejs_version: '0.10'
 install:
   - ps: Install-Product node $env:nodejs_version
   - set CI=true
diff --git a/lib/browser/debug.js b/lib/browser/debug.js
deleted file mode 100644
index 3d12160f1a..0000000000
--- a/lib/browser/debug.js
+++ /dev/null
@@ -1,7 +0,0 @@
-'use strict';
-
-function noop () {}
-
-module.exports = function () {
-  return noop;
-};
diff --git a/lib/browser/events.js b/lib/browser/events.js
deleted file mode 100644
index e46a9f5f05..0000000000
--- a/lib/browser/events.js
+++ /dev/null
@@ -1,195 +0,0 @@
-'use strict';
-
-/**
- * Module exports.
- */
-
-exports.EventEmitter = EventEmitter;
-
-/**
- * Object#toString reference.
- */
-var objToString = Object.prototype.toString;
-
-/**
- * Check if a value is an array.
- *
- * @api private
- * @param {*} val The value to test.
- * @return {boolean} true if the value is an array, otherwise false.
- */
-function isArray (val) {
-  return objToString.call(val) === '[object Array]';
-}
-
-/**
- * Event emitter constructor.
- *
- * @api public
- */
-function EventEmitter () {}
-
-/**
- * Add a listener.
- *
- * @api public
- * @param {string} name Event name.
- * @param {Function} fn Event handler.
- * @return {EventEmitter} Emitter instance.
- */
-EventEmitter.prototype.on = function (name, fn) {
-  if (!this.$events) {
-    this.$events = {};
-  }
-
-  if (!this.$events[name]) {
-    this.$events[name] = fn;
-  } else if (isArray(this.$events[name])) {
-    this.$events[name].push(fn);
-  } else {
-    this.$events[name] = [this.$events[name], fn];
-  }
-
-  return this;
-};
-
-EventEmitter.prototype.addListener = EventEmitter.prototype.on;
-
-/**
- * Adds a volatile listener.
- *
- * @api public
- * @param {string} name Event name.
- * @param {Function} fn Event handler.
- * @return {EventEmitter} Emitter instance.
- */
-EventEmitter.prototype.once = function (name, fn) {
-  var self = this;
-
-  function on () {
-    self.removeListener(name, on);
-    fn.apply(this, arguments);
-  }
-
-  on.listener = fn;
-  this.on(name, on);
-
-  return this;
-};
-
-/**
- * Remove a listener.
- *
- * @api public
- * @param {string} name Event name.
- * @param {Function} fn Event handler.
- * @return {EventEmitter} Emitter instance.
- */
-EventEmitter.prototype.removeListener = function (name, fn) {
-  if (this.$events && this.$events[name]) {
-    var list = this.$events[name];
-
-    if (isArray(list)) {
-      var pos = -1;
-
-      for (var i = 0, l = list.length; i < l; i++) {
-        if (list[i] === fn || (list[i].listener && list[i].listener === fn)) {
-          pos = i;
-          break;
-        }
-      }
-
-      if (pos < 0) {
-        return this;
-      }
-
-      list.splice(pos, 1);
-
-      if (!list.length) {
-        delete this.$events[name];
-      }
-    } else if (list === fn || (list.listener && list.listener === fn)) {
-      delete this.$events[name];
-    }
-  }
-
-  return this;
-};
-
-/**
- * Remove all listeners for an event.
- *
- * @api public
- * @param {string} name Event name.
- * @return {EventEmitter} Emitter instance.
- */
-EventEmitter.prototype.removeAllListeners = function (name) {
-  if (name === undefined) {
-    this.$events = {};
-    return this;
-  }
-
-  if (this.$events && this.$events[name]) {
-    this.$events[name] = null;
-  }
-
-  return this;
-};
-
-/**
- * Get all listeners for a given event.
- *
- * @api public
- * @param {string} name Event name.
- * @return {EventEmitter} Emitter instance.
- */
-EventEmitter.prototype.listeners = function (name) {
-  if (!this.$events) {
-    this.$events = {};
-  }
-
-  if (!this.$events[name]) {
-    this.$events[name] = [];
-  }
-
-  if (!isArray(this.$events[name])) {
-    this.$events[name] = [this.$events[name]];
-  }
-
-  return this.$events[name];
-};
-
-/**
- * Emit an event.
- *
- * @api public
- * @param {string} name Event name.
- * @return {boolean} true if at least one handler was invoked, else false.
- */
-EventEmitter.prototype.emit = function (name) {
-  if (!this.$events) {
-    return false;
-  }
-
-  var handler = this.$events[name];
-
-  if (!handler) {
-    return false;
-  }
-
-  var args = Array.prototype.slice.call(arguments, 1);
-
-  if (typeof handler === 'function') {
-    handler.apply(this, args);
-  } else if (isArray(handler)) {
-    var listeners = handler.slice();
-
-    for (var i = 0, l = listeners.length; i < l; i++) {
-      listeners[i].apply(this, args);
-    }
-  } else {
-    return false;
-  }
-
-  return true;
-};
diff --git a/lib/browser/growl.js b/lib/browser/growl.js
new file mode 100644
index 0000000000..28c62efbec
--- /dev/null
+++ b/lib/browser/growl.js
@@ -0,0 +1,5 @@
+'use strict';
+
+// just stub out growl
+
+module.exports = require('../utils').noop;
diff --git a/lib/reporters/base.js b/lib/reporters/base.js
index 5018e6f9c3..aab912e5f4 100644
--- a/lib/reporters/base.js
+++ b/lib/reporters/base.js
@@ -120,8 +120,8 @@ exports.window = {
 
 if (isatty) {
   exports.window.width = process.stdout.getWindowSize
-      ? process.stdout.getWindowSize(1)[0]
-      : tty.getWindowSize()[1];
+    ? process.stdout.getWindowSize(1)[0]
+    : tty.getWindowSize()[1];
 }
 
 /**
diff --git a/lib/runner.js b/lib/runner.js
index 039065a2e0..fad9a8b1f8 100644
--- a/lib/runner.js
+++ b/lib/runner.js
@@ -229,7 +229,7 @@ Runner.prototype.fail = function (test, err) {
   ++this.failures;
   test.state = 'failed';
 
-  if (!(err instanceof Error || err && typeof err.message === 'string')) {
+  if (!((err instanceof Error || err) && typeof err.message === 'string')) {
     err = new Error('the ' + type(err) + ' ' + stringify(err) + ' was thrown, throw an Error :)');
   }
 
@@ -722,7 +722,7 @@ Runner.prototype.uncaught = function (err) {
     return;
   }
 
- // recover from hooks
+  // recover from hooks
   if (runnable.type === 'hook') {
     var errSuite = this.suite;
     // if hook failure is in afterEach block
diff --git a/lib/utils.js b/lib/utils.js
index c40c97cd75..046e097296 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -540,8 +540,8 @@ function jsonStringify (object, spaces, depth) {
     --length;
     str += '\n ' + repeat(' ', space) +
       (isArray(object) ? '' : '"' + i + '": ') + // key
-      _stringify(object[i]) +                    // value
-      (length ? ',' : '');                       // comma
+      _stringify(object[i]) + // value
+      (length ? ',' : ''); // comma
   }
 
   return str +
diff --git a/package.json b/package.json
index 8505bb4a78..3a603d37b2 100644
--- a/package.json
+++ b/package.json
@@ -295,8 +295,8 @@
     "_mocha": "./bin/_mocha"
   },
   "engines": {
-    "node": ">= 0.10.x",
-    "npm": ">= 1.4.x"
+    "node": ">= 4.0.0",
+    "npm": ">= 2.14.2"
   },
   "scripts": {
     "lint": "eslint . bin/*",
@@ -307,11 +307,11 @@
   "dependencies": {
     "browser-stdout": "1.3.0",
     "commander": "2.9.0",
-    "debug": "2.6.8",
+    "debug": "2.6.9",
     "diff": "3.2.0",
     "escape-string-regexp": "1.0.5",
     "glob": "7.1.1",
-    "growl": "1.9.2",
+    "growl": "1.10.2",
     "he": "1.1.1",
     "json3": "3.3.2",
     "lodash.create": "3.1.1",
@@ -325,11 +325,13 @@
     "coffee-script": "^1.10.0",
     "coveralls": "^2.11.15",
     "cross-spawn": "^5.1.0",
-    "eslint": "^3.11.1",
-    "eslint-config-semistandard": "^7.0.0",
-    "eslint-config-standard": "^6.2.1",
+    "eslint": "^4.7.2",
+    "eslint-config-semistandard": "^11.0.0",
+    "eslint-config-standard": "^10.2.1",
+    "eslint-plugin-import": "^2.7.0",
+    "eslint-plugin-node": "^5.1.1",
     "eslint-plugin-promise": "^3.4.0",
-    "eslint-plugin-standard": "2.0.1",
+    "eslint-plugin-standard": "^3.0.1",
     "expect.js": "^0.3.1",
     "karma": "1.3.0",
     "karma-browserify": "^5.0.5",
@@ -337,13 +339,13 @@
     "karma-expect": "^1.1.2",
     "karma-mocha": "^1.3.0",
     "karma-phantomjs-launcher": "0.2.3",
-    "karma-spec-reporter": "0.0.26",
+    "karma-spec-reporter": "0.0.31",
     "nyc": "^11.2.1",
     "os-name": "^2.0.1",
     "phantomjs": "1.9.8",
     "readable-stream": "2.2.11",
     "rimraf": "^2.5.2",
-    "should": "^9.0.2",
+    "should": "^13.1.0",
     "through2": "^2.0.1",
     "watchify": "^3.7.0"
   },
@@ -359,8 +361,7 @@
     "bower.json"
   ],
   "browser": {
-    "debug": "./lib/browser/debug.js",
-    "events": "./lib/browser/events.js",
+    "growl": "./lib/browser/growl.js",
     "tty": "./lib/browser/tty.js",
     "./index.js": "./browser-entry.js",
     "fs": false,
diff --git a/test/.eslintrc.yaml b/test/.eslintrc.yaml
index a32fd84d48..92622be761 100644
--- a/test/.eslintrc.yaml
+++ b/test/.eslintrc.yaml
@@ -3,3 +3,5 @@ env:
 globals:
   expect: false
   assert: false
+rules:
+  no-unused-expressions: off
diff --git a/test/compiler-fixtures/foo.js b/test/compiler-fixtures/foo.fixture.js
similarity index 99%
rename from test/compiler-fixtures/foo.js
rename to test/compiler-fixtures/foo.fixture.js
index 753d08e740..41f1a62808 100644
--- a/test/compiler-fixtures/foo.js
+++ b/test/compiler-fixtures/foo.fixture.js
@@ -1,6 +1,7 @@
 'use strict';
 
 var fs = require('fs');
+
 require.extensions['.foo'] = function (module, filename) {
   var content;
   content = fs.readFileSync(filename, 'utf8');
diff --git a/test/integration/compiler-globbing.spec.js b/test/integration/compiler-globbing.spec.js
index fe038229c1..ee0a7237a5 100644
--- a/test/integration/compiler-globbing.spec.js
+++ b/test/integration/compiler-globbing.spec.js
@@ -6,7 +6,7 @@ var path = require('path');
 
 describe('globbing like --compilers', function () {
   it('should find a file of each type', function (done) {
-    exec('"' + process.execPath + '" "' + path.join('bin', 'mocha') + '" -R json --require coffee-script/register --require test/compiler-fixtures/foo "test/compiler/*.@(coffee|foo)"', { cwd: path.join(__dirname, '..', '..') }, function (error, stdout) {
+    exec('"' + process.execPath + '" "' + path.join('bin', 'mocha') + '" -R json --require coffee-script/register --require test/compiler-fixtures/foo.fixture "test/compiler/*.@(coffee|foo)"', { cwd: path.join(__dirname, '..', '..') }, function (error, stdout) {
       if (error && !stdout) { return done(error); }
       var results = JSON.parse(stdout);
       expect(results).to.have.property('tests');
diff --git a/test/integration/helpers.js b/test/integration/helpers.js
index f2d9c81192..a22ce67c77 100644
--- a/test/integration/helpers.js
+++ b/test/integration/helpers.js
@@ -89,7 +89,7 @@ module.exports = {
       } else if (!diffs.length || inStackTrace) {
         // Haven't encountered a spec yet
         // or we're in the middle of a stack trace
-        return;
+
       } else if (line.indexOf('+ expected - actual') !== -1) {
         inDiff = true;
       } else if (line.match(/at Context/)) {
diff --git a/test/unit/utils.spec.js b/test/unit/utils.spec.js
index 4ef87c60ee..3f643ea27a 100644
--- a/test/unit/utils.spec.js
+++ b/test/unit/utils.spec.js
@@ -164,10 +164,10 @@ describe('lib/utils', function () {
     });
 
     it('should return Buffer with .toJSON representation', function () {
-      expect(stringify(new Buffer([0x01]))).to.equal('[\n  1\n]');
-      expect(stringify(new Buffer([0x01, 0x02]))).to.equal('[\n  1\n  2\n]');
+      expect(stringify(Buffer.from([0x01]))).to.equal('[\n  1\n]');
+      expect(stringify(Buffer.from([0x01, 0x02]))).to.equal('[\n  1\n  2\n]');
 
-      expect(stringify(new Buffer('ABCD'))).to.equal('[\n  65\n  66\n  67\n  68\n]');
+      expect(stringify(Buffer.from('ABCD'))).to.equal('[\n  65\n  66\n  67\n  68\n]');
     });
 
     it('should return Date object with .toISOString() + string prefix', function () {
@@ -224,7 +224,7 @@ describe('lib/utils', function () {
           infi: Infinity,
           nan: NaN,
           zero: -0,
-          buffer: new Buffer([0x01, 0x02]),
+          buffer: Buffer.from([0x01, 0x02]),
           array: [1, 2, 3],
           empArr: [],
           matrix: [[1],
@@ -498,7 +498,7 @@ describe('lib/utils', function () {
   describe('isBuffer()', function () {
     var isBuffer = utils.isBuffer;
     it('should test if object is a Buffer', function () {
-      expect(isBuffer(new Buffer([0x01])))
+      expect(isBuffer(Buffer.from([0x01])))
         .to
         .equal(true);
       expect(isBuffer({}))