diff --git a/.travis.yml b/.travis.yml
index 9144899aff6b..e8536f5a4d7c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,5 @@
 language: node_js
 node_js:
-- "0.10"
+- "iojs-v1"
+- "iojs-v2"
 sudo: false
diff --git a/bin/jest.js b/bin/jest.js
index 29c528413edb..12baa245116f 100755
--- a/bin/jest.js
+++ b/bin/jest.js
@@ -10,7 +10,6 @@
 'use strict';
 
 var fs = require('fs');
-var harmonize = require('harmonize');
 var optimist = require('optimist');
 var path = require('path');
 
@@ -36,8 +35,6 @@ function _wrapDesc(desc) {
   }, ['']).join(indent);
 }
 
-harmonize();
-
 var argv = optimist
   .usage('Usage: $0 [--config=<pathToConfigFile>] [TestPathRegExp]')
   .options({
diff --git a/package.json b/package.json
index c8ac59d28c6d..2edd164c2edb 100644
--- a/package.json
+++ b/package.json
@@ -4,32 +4,30 @@
   "version": "0.4.5",
   "main": "src/jest.js",
   "dependencies": {
-    "coffee-script": "^1.8.0",
-    "cover": "~0.2.8",
-    "diff": "~1.0.4",
-    "graceful-fs": "^2.0.3",
-    "harmonize": "1.4.2",
-    "istanbul": "^0.3.2",
-    "jasmine-only": "0.1.0",
-    "jasmine-pit": "~2.0.0",
-    "jsdom": "~0.10.3",
+    "coffee-script": "ide/coffeescript#array-check",
+    "cover": "^0.2.9",
+    "diff": "^1.4.0",
+    "graceful-fs": "^3.0.7",
+    "istanbul": "^0.3.14",
+    "jasmine-only": "^0.1.1",
+    "jasmine-pit": "^2.0.2",
+    "jsdom": "^5.4.2",
     "node-haste": "^1.2.8",
-    "node-worker-pool": "~2.4.2",
-    "optimist": "~0.6.0",
-    "q": "~0.9.7",
-    "resolve": "~0.6.1",
-    "through": "^2.3.4",
-    "lodash.template": "^3.0.0"
+    "node-worker-pool": "^2.4.4",
+    "optimist": "^0.6.1",
+    "q": "^1.4.1",
+    "resolve": "^1.1.6",
+    "through": "^2.3.7"
   },
   "devDependencies": {
-    "jshint": "~2.5.0",
-    "node-find-files": "0.0.2"
+    "jshint": "^2.7.0",
+    "node-find-files": "0.0.4"
   },
   "bin": {
     "jest": "./bin/jest.js"
   },
   "engines": {
-    "node": "0.8.x || 0.10.x"
+    "node": ">= 1"
   },
   "repository": {
     "type": "git",
diff --git a/src/HasteModuleLoader/HasteModuleLoader.js b/src/HasteModuleLoader/HasteModuleLoader.js
index 9b1a3d7a8f14..8b3958c4f749 100644
--- a/src/HasteModuleLoader/HasteModuleLoader.js
+++ b/src/HasteModuleLoader/HasteModuleLoader.js
@@ -129,15 +129,6 @@ function Loader(config, environment, resourceMap) {
   this._configShouldMockModuleNames = {};
 
   if (_configUnmockListRegExpCache === null) {
-    // Node must have been run with --harmony in order for WeakMap to be
-    // available prior to version 0.12
-    if (typeof WeakMap !== 'function') {
-      throw new Error(
-        'Please run node with the --harmony flag! jest requires WeakMap ' +
-        'which is only available with the --harmony flag in node < v0.12'
-      );
-    }
-
     _configUnmockListRegExpCache = new WeakMap();
   }
 
@@ -862,14 +853,14 @@ Loader.prototype.requireModule = function(currPath, moduleName,
     modulePath = manualMockResource.path;
   }
 
-  if (!modulePath) {
-    modulePath = this._moduleNameToPath(currPath, moduleName);
-  }
-
   if (NODE_CORE_MODULES[moduleName]) {
     return require(moduleName);
   }
 
+  if (!modulePath) {
+    modulePath = this._moduleNameToPath(currPath, moduleName);
+  }
+
   // Always natively require the jasmine runner.
   if (modulePath.indexOf(VENDOR_PATH) === 0) {
     return require(modulePath);
@@ -1037,6 +1028,10 @@ Loader.prototype.resetModuleRegistry = function() {
             this._environment.fakeTimers.runAllTicks();
           }.bind(this),
 
+          runAllImmediates: function() {
+            this._environment.fakeTimers.runAllImmediates();
+          }.bind(this),
+
           runAllTimers: function() {
             this._environment.fakeTimers.runAllTimers();
           }.bind(this),
diff --git a/src/JSDomEnvironment.js b/src/JSDomEnvironment.js
index a6efe560f926..a3163b515717 100644
--- a/src/JSDomEnvironment.js
+++ b/src/JSDomEnvironment.js
@@ -9,6 +9,8 @@
 
 var FakeTimers = require('./lib/FakeTimers');
 
+var vm = require('vm');
+
 function _deepCopy(obj) {
   var newObj = {};
   var value;
@@ -29,7 +31,9 @@ function JSDomEnvironment(config) {
   // use it (depending on the context -- such as TestRunner.js when operating as
   // a workerpool parent), this is the best way to ensure we only spend time
   // require()ing this when necessary.
-  this.global = require('./lib/jsdom-compat').jsdom().parentWindow;
+  var jsdom = require('./lib/jsdom-compat');
+  this.document = jsdom.jsdom();
+  this.global = this.document.defaultView;
 
   // Node's error-message stack size is limited at 10, but it's pretty useful to
   // see more than that when a test fails.
@@ -52,7 +56,6 @@ function JSDomEnvironment(config) {
   this.global.Uint32Array = Uint32Array;
   this.global.DataView = DataView;
   this.global.Buffer = Buffer;
-  this.global.process = process;
   this.global.setImmediate = setImmediate;
   this.global.clearImmediate = clearImmediate;
 
@@ -104,8 +107,17 @@ JSDomEnvironment.prototype.dispose = function() {
   //this.global.close();
 };
 
+/**
+ * Evaluates the given source text as if it were in a file with the given name
+ * and returns the result.
+ */
 JSDomEnvironment.prototype.runSourceText = function(sourceText, fileName) {
-  return this.global.run(sourceText, fileName);
+  // TODO: Stop using the private API and instead configure jsdom with a
+  // resource loader and insert <script src="${filename}"> in the document. The
+  // reason we use vm for now is because the script element technique is slow.
+  return vm.runInContext(sourceText, this.document._ownerDocument._global, {
+    filename: fileName,
+  });
 };
 
 JSDomEnvironment.prototype.runWithRealTimers = function(cb) {
diff --git a/src/TestRunner.js b/src/TestRunner.js
index b574db01d4d4..23b36bf41cdf 100644
--- a/src/TestRunner.js
+++ b/src/TestRunner.js
@@ -494,7 +494,6 @@ TestRunner.prototype._createParallelTestRun = function(
     this._opts.maxWorkers,
     this._opts.nodePath,
     this._opts.nodeArgv.concat([
-      '--harmony',
       TEST_WORKER_PATH,
       '--config=' + JSON.stringify(this._config)
     ])
diff --git a/src/jasmineTestRunner/JasmineReporter.js b/src/jasmineTestRunner/JasmineReporter.js
index 17720e965a02..a0ee9d5be26b 100644
--- a/src/jasmineTestRunner/JasmineReporter.js
+++ b/src/jasmineTestRunner/JasmineReporter.js
@@ -201,14 +201,7 @@ JasmineReporter.prototype._prettyPrint = function(obj, indent, cycleWeakMap) {
       ')';
     }
 
-    /* jshint camelcase:false */
     if (!cycleWeakMap) {
-      if (typeof WeakMap !== 'function') {
-        throw new Error(
-          'Please run node with the --harmony flag! jest requires WeakMap ' +
-          'which is only available with the --harmony flag in node < v0.12'
-        );
-      }
       cycleWeakMap = new WeakMap();
     }
 
@@ -231,6 +224,7 @@ JasmineReporter.prototype._prettyPrint = function(obj, indent, cycleWeakMap) {
         this._prettyPrint(value, indent + keyIndent, cycleWeakMap)
       );
     }
+    /* jshint camelcase:false */
     delete obj.__jstest_pp_cycle__;
     return '{\n' + keysOutput.join(',\n') + '\n' + indent + '}';
   } else {
diff --git a/src/jasmineTestRunner/jasmineTestRunner.js b/src/jasmineTestRunner/jasmineTestRunner.js
index 701771b420a3..f92f940f1d0d 100644
--- a/src/jasmineTestRunner/jasmineTestRunner.js
+++ b/src/jasmineTestRunner/jasmineTestRunner.js
@@ -54,15 +54,6 @@ function jasmineTestRunner(config, environment, moduleLoader, testPath) {
     // Install jasmine-only
     environment.runSourceText(jasmineOnlyContent);
 
-    // Node must have been run with --harmony in order for WeakMap to be
-    // available prior to version 0.12
-    if (typeof WeakMap !== 'function') {
-      throw new Error(
-        'Please run node with the --harmony flag! jest requires WeakMap ' +
-        'which is only available with the --harmony flag in node < v0.12'
-      );
-    }
-
     // Mainline Jasmine sets __Jasmine_been_here_before__ on each object to
     // detect cycles, but that doesn't work on frozen objects so we use a
     // WeakMap instead.
diff --git a/src/lib/FakeTimers.js b/src/lib/FakeTimers.js
index c03c4bb218be..059aa64dc941 100644
--- a/src/lib/FakeTimers.js
+++ b/src/lib/FakeTimers.js
@@ -315,10 +315,18 @@ FakeTimers.prototype._fakeClearImmediate = function(uuid) {
 };
 
 FakeTimers.prototype._fakeNextTick = function(callback) {
+  var args = [];
+  for (var ii = 1, ll = arguments.length; ii < ll; ii++) {
+    args.push(arguments[ii]);
+  }
+
   var uuid = this._uuidCounter++;
+
   this._ticks.push({
     uuid: uuid,
-    callback: callback
+    callback: function() {
+      return callback.apply(null, args);
+    }
   });
 
   var cancelledTicks = this._cancelledTicks;
@@ -326,7 +334,7 @@ FakeTimers.prototype._fakeNextTick = function(callback) {
     if (!cancelledTicks.hasOwnProperty(uuid)) {
       // Callback may throw, so update the map prior calling.
       cancelledTicks[uuid] = true;
-      callback();
+      callback.apply(null, args);
     }
   });
 };
@@ -351,7 +359,7 @@ FakeTimers.prototype._fakeSetImmediate = function(callback) {
     if (!cancelledImmediates.hasOwnProperty(uuid)) {
       // Callback may throw, so update the map prior calling.
       cancelledImmediates[uuid] = true;
-      callback();
+      callback.apply(null, args);
     }
   });