diff --git a/README.md b/README.md
index d598c5db..d732f575 100644
--- a/README.md
+++ b/README.md
@@ -11,10 +11,16 @@ Check our docs page to get a complete guide on how to install it in an existing
 
 ## News
 
-The version 1.x of the PHP SDK now works with the Auth API v2 which adds lots of new [features and changes](https://auth0.com/docs/apiv2Changes).
+- The version 2.x of the PHP SDK was updated to work with Guzzle 6.1. For compatibility fith Guzzle 5, you should use 1.x branch.
+- The version 1.x of the PHP SDK now works with the Auth API v2 which adds lots of new [features and changes](https://auth0.com/docs/apiv2Changes).
 
 ### Backward compatibility breaks
 
+2.x
+- Session storage now returns null (and null is expected by the sdk) if there is no info stored (this change was made since false is a valid value to be stored in session).
+- Guzzle 6.1 required
+
+1.x
 - Now, all the SDK is under the namespace `\Auth0\SDK`
 - The exceptions were moved to the namespace `\Auth0\SDK\Exceptions`
 - The method `Auth0::getUserInfo` is deprecated and soon to be removed. We encourage to use `Auth0::getUser` to enforce the adoption of the API v2
@@ -55,6 +61,11 @@ $ composer install
 $ php -S localhost:3000
 ```
 
+## Migration guide from 1.x
+
+1. If you use Guzzle (or some other dependency does), you will need to update it to work with Guzzle 6.1.
+2. 
+
 ## Migration guide from 0.6.6
 
 1. First is important to read the [API v2 changes document](https://auth0.com/docs/apiv2Changes) to catch up the latest changes to the API.
diff --git a/composer.json b/composer.json
index 52c87fdf..fb5f8eed 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
   ],
   "require": {
     "php": ">=5.4.0",
-    "guzzlehttp/guzzle": "~5.0",
+    "guzzlehttp/guzzle": "^6.1",
     "ext-json": "*",
     "adoy/oauth2": "~1.3",
     "firebase/php-jwt" : "~2.2"
diff --git a/examples/basic-api/composer.json b/examples/basic-api/composer.json
index c5380cd7..4f11bd43 100644
--- a/examples/basic-api/composer.json
+++ b/examples/basic-api/composer.json
@@ -3,9 +3,8 @@
     "description": "Basic sample for securing an API",
     "require": {
         "bramus/router": "dev-master",
-        "adoy/oauth2": "dev-master",
         "vlucas/phpdotenv": "1.1.1",
-        "auth0/auth0-php": "~1.0"
+        "auth0/auth0-php": "~2.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/examples/basic-oauth/composer.json b/examples/basic-oauth/composer.json
index e5a46898..fa522c81 100644
--- a/examples/basic-oauth/composer.json
+++ b/examples/basic-oauth/composer.json
@@ -2,9 +2,8 @@
     "name": "auth0/basic-webapp-sample",
     "description": "Basic sample for securing a WebApp with Auth0",
     "require": {
-        "adoy/oauth2": "dev-master",
         "vlucas/phpdotenv": "1.1.1",
-        "auth0/auth0-php": "~1.0"
+        "auth0/auth0-php": "~2.0"
     },
     "license": "MIT",
     "authors": [
diff --git a/examples/basic-webapp/composer.json b/examples/basic-webapp/composer.json
index 078dbd38..30b22fa3 100644
--- a/examples/basic-webapp/composer.json
+++ b/examples/basic-webapp/composer.json
@@ -2,9 +2,8 @@
     "name": "auth0/basic-webapp-sample",
     "description": "Basic sample for securing a WebApp with Auth0",
     "require": {
-         "adoy/oauth2": "dev-master",
          "vlucas/phpdotenv": "1.1.1",
-         "auth0/auth0-php": "~1.0"
+         "auth0/auth0-php": "~2.0"
     },
     "license": "MIT",
     "authors": [
diff --git a/examples/link-users/composer.json b/examples/link-users/composer.json
index e5a46898..fa522c81 100644
--- a/examples/link-users/composer.json
+++ b/examples/link-users/composer.json
@@ -2,9 +2,8 @@
     "name": "auth0/basic-webapp-sample",
     "description": "Basic sample for securing a WebApp with Auth0",
     "require": {
-        "adoy/oauth2": "dev-master",
         "vlucas/phpdotenv": "1.1.1",
-        "auth0/auth0-php": "~1.0"
+        "auth0/auth0-php": "~2.0"
     },
     "license": "MIT",
     "authors": [
diff --git a/src/API/RequestBuilder.php b/src/API/RequestBuilder.php
index 9015401f..ccd77dce 100644
--- a/src/API/RequestBuilder.php
+++ b/src/API/RequestBuilder.php
@@ -89,13 +89,14 @@ public function call() {
         $method = $this->method;
 
         try {
-
-            $response = $client->$method($this->getUrl(), array(
+            
+            $response = $client->request($this->method, $this->getUrl(), [
                 'headers' => $this->headers,
-                'body' => $this->body
-            ));
+                'body' => $this->body,
+            ]);
+            $body = (string) $response->getBody();
 
-            return $response->json(array('object' => false));
+            return json_decode($body, true);
 
         } catch (RequestException $e) {
             throw $e;
diff --git a/src/Auth0.php b/src/Auth0.php
index 57a209c5..d0561572 100644
--- a/src/Auth0.php
+++ b/src/Auth0.php
@@ -273,7 +273,7 @@ private function exchangeCode() {
      */
     public function getUser() {
         // Ensure we have the user info
-        if ($this->user === false) {
+        if ($this->user === null) {
             $this->exchangeCode();
         }
         if (!is_array($this->user)) {
@@ -352,7 +352,7 @@ public function setAccessToken($access_token) {
      * @return string
      */
     final public function getAccessToken() {
-        if ($this->access_token === false) {
+        if ($this->access_token === null) {
             $this->exchangeCode();
         }
         return $this->access_token;
@@ -381,7 +381,7 @@ public function setIdToken($id_token) {
      * @return string
      */
     final public function getIdToken() {
-        if ($this->id_token === false) {
+        if ($this->id_token === null) {
             $this->exchangeCode();
         }
         return $this->id_token;
diff --git a/src/Store/EmptyStore.php b/src/Store/EmptyStore.php
index c52552b4..c23e9300 100644
--- a/src/Store/EmptyStore.php
+++ b/src/Store/EmptyStore.php
@@ -23,7 +23,7 @@ class EmptyStore
     public function set($key, $value) {
     }
 
-    public function get($key, $default=false) {
+    public function get($key, $default=null) {
         return $default;
     }
 
diff --git a/src/Store/SessionStore.php b/src/Store/SessionStore.php
index e7d24c4a..a9c7018b 100644
--- a/src/Store/SessionStore.php
+++ b/src/Store/SessionStore.php
@@ -65,7 +65,7 @@ public function set($key, $value) {
      *
      * @return mixed
      */
-    public function get($key, $default=false) {
+    public function get($key, $default=null) {
         $key_name = $this->getSessionKeyName($key);
 
         if (isset($_SESSION[$key_name])) {