diff --git a/.travis.yml b/.travis.yml
index 2fce81e..f7fe068 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 sudo: false
 language: node_js
 node_js:
-  - "4"
+  - "6"
 
 script:
   - npm test
diff --git a/package.json b/package.json
index 00b64fa..0c47a33 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
   "devDependencies": {
     "jasmine": "2.4.1",
     "jshint": "2.5.0",
-    "selenium-webdriver": "^3.0.0-beta-3",
+    "selenium-webdriver": "^3.0.0",
     "typescript": "^2.0.0"
   },
   "repository": {
@@ -29,5 +29,8 @@
     "test": "scripts/test.sh"
   },
   "license": "MIT",
+  "engines": {
+    "node": ">= 6.9.0"
+  },
   "version": "0.1.0-beta.0"
 }
diff --git a/spec/adapterSpec.js b/spec/adapterSpec.js
index 6fce99e..6d4722f 100644
--- a/spec/adapterSpec.js
+++ b/spec/adapterSpec.js
@@ -76,9 +76,9 @@ describe('webdriverJS Jasmine adapter', function() {
 
   it('should wait till the expect to run the flow', function() {
     var promiseA = fakeDriver.getValueA();
-    expect(promiseA.isPending()).toBe(true);
+    expect(common.isPending(promiseA)).toBe(true);
     expect(promiseA).toEqual('a');
-    expect(promiseA.isPending()).toBe(true);
+    expect(common.isPending(promiseA)).toBe(true);
   });
 
   it('should compare a promise to a promise', function() {
diff --git a/spec/common.js b/spec/common.js
index efbd48f..6786640 100644
--- a/spec/common.js
+++ b/spec/common.js
@@ -123,3 +123,7 @@ exports.getMatchers = function() {
     }
   };
 };
+
+exports.isPending = function(managedPromise) {
+  return managedPromise.state_ === 'pending';
+};