diff --git a/README.md b/README.md
index 9d6ca5b1..db003993 100644
--- a/README.md
+++ b/README.md
@@ -19,23 +19,15 @@ PHP 5.6 and later
 ## Installation & Usage
 ### Composer
 
-To install the bindings via [Composer](http://getcomposer.org/), add the following to `composer.json`:
+To install the bindings via [Composer](http://getcomposer.org/):
 
 ```
-{
-  "repositories": [
-    {
-      "type": "git",
-      "url": "https://github.com/sendinblue/APIv3-php-library.git"
-    }
-  ],
-  "require": {
-    "sendinblue/api-v3-sdk": "*@dev"
-  }
-}
+composer require sendinblue/api-v3-sdk "^6.0.0"
 ```
 
-Then run `composer install`
+Further do:
+* run `composer install` to get these dependencies added to your vendor directory
+* add the autoloader to your application with this line: require(__DIR__ . '/vendor/autoload.php')
 
 ### Manual Installation
 
diff --git a/composer.lock b/composer.lock
index c96f5981..fa9e607c 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1435,16 +1435,16 @@
         },
         {
             "name": "symfony/console",
-            "version": "v3.4.10",
+            "version": "v3.4.12",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/console.git",
-                "reference": "36f83f642443c46f3cf751d4d2ee5d047d757a27"
+                "reference": "1b97071a26d028c9bd4588264e101e14f6e7cd00"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/console/zipball/36f83f642443c46f3cf751d4d2ee5d047d757a27",
-                "reference": "36f83f642443c46f3cf751d4d2ee5d047d757a27",
+                "url": "https://api.github.com/repos/symfony/console/zipball/1b97071a26d028c9bd4588264e101e14f6e7cd00",
+                "reference": "1b97071a26d028c9bd4588264e101e14f6e7cd00",
                 "shasum": ""
             },
             "require": {
@@ -1500,20 +1500,20 @@
             ],
             "description": "Symfony Console Component",
             "homepage": "https://symfony.com",
-            "time": "2018-05-16T08:49:21+00:00"
+            "time": "2018-05-23T05:02:55+00:00"
         },
         {
             "name": "symfony/debug",
-            "version": "v3.4.10",
+            "version": "v3.4.12",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/debug.git",
-                "reference": "b28fd73fefbac341f673f5efd707d539d6a19f68"
+                "reference": "47e6788c5b151cf0cfdf3329116bf33800632d75"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/debug/zipball/b28fd73fefbac341f673f5efd707d539d6a19f68",
-                "reference": "b28fd73fefbac341f673f5efd707d539d6a19f68",
+                "url": "https://api.github.com/repos/symfony/debug/zipball/47e6788c5b151cf0cfdf3329116bf33800632d75",
+                "reference": "47e6788c5b151cf0cfdf3329116bf33800632d75",
                 "shasum": ""
             },
             "require": {
@@ -1556,11 +1556,11 @@
             ],
             "description": "Symfony Debug Component",
             "homepage": "https://symfony.com",
-            "time": "2018-05-16T14:03:39+00:00"
+            "time": "2018-06-25T11:10:40+00:00"
         },
         {
             "name": "symfony/event-dispatcher",
-            "version": "v3.4.10",
+            "version": "v3.4.12",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/event-dispatcher.git",
@@ -1623,16 +1623,16 @@
         },
         {
             "name": "symfony/filesystem",
-            "version": "v3.4.10",
+            "version": "v3.4.12",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/filesystem.git",
-                "reference": "8e03ca3fa52a0f56b87506f38cf7bd3f9442b3a0"
+                "reference": "8a721a5f2553c6c3482b1c5b22ed60fe94dd63ed"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/filesystem/zipball/8e03ca3fa52a0f56b87506f38cf7bd3f9442b3a0",
-                "reference": "8e03ca3fa52a0f56b87506f38cf7bd3f9442b3a0",
+                "url": "https://api.github.com/repos/symfony/filesystem/zipball/8a721a5f2553c6c3482b1c5b22ed60fe94dd63ed",
+                "reference": "8a721a5f2553c6c3482b1c5b22ed60fe94dd63ed",
                 "shasum": ""
             },
             "require": {
@@ -1669,20 +1669,20 @@
             ],
             "description": "Symfony Filesystem Component",
             "homepage": "https://symfony.com",
-            "time": "2018-05-16T08:49:21+00:00"
+            "time": "2018-06-21T11:10:19+00:00"
         },
         {
             "name": "symfony/finder",
-            "version": "v3.4.10",
+            "version": "v3.4.12",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/finder.git",
-                "reference": "472a92f3df8b247b49ae364275fb32943b9656c6"
+                "reference": "3a8c3de91d2b2c68cd2d665cf9d00f7ef9eaa394"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/finder/zipball/472a92f3df8b247b49ae364275fb32943b9656c6",
-                "reference": "472a92f3df8b247b49ae364275fb32943b9656c6",
+                "url": "https://api.github.com/repos/symfony/finder/zipball/3a8c3de91d2b2c68cd2d665cf9d00f7ef9eaa394",
+                "reference": "3a8c3de91d2b2c68cd2d665cf9d00f7ef9eaa394",
                 "shasum": ""
             },
             "require": {
@@ -1718,7 +1718,7 @@
             ],
             "description": "Symfony Finder Component",
             "homepage": "https://symfony.com",
-            "time": "2018-05-16T08:49:21+00:00"
+            "time": "2018-06-19T20:52:10+00:00"
         },
         {
             "name": "symfony/polyfill-ctype",
@@ -1836,16 +1836,16 @@
         },
         {
             "name": "symfony/process",
-            "version": "v3.4.10",
+            "version": "v3.4.12",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/process.git",
-                "reference": "4cbf2db9abcb01486a21b7a059e03a62fae63187"
+                "reference": "acc5a37c706ace827962851b69705b24e71ca17c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/process/zipball/4cbf2db9abcb01486a21b7a059e03a62fae63187",
-                "reference": "4cbf2db9abcb01486a21b7a059e03a62fae63187",
+                "url": "https://api.github.com/repos/symfony/process/zipball/acc5a37c706ace827962851b69705b24e71ca17c",
+                "reference": "acc5a37c706ace827962851b69705b24e71ca17c",
                 "shasum": ""
             },
             "require": {
@@ -1881,11 +1881,11 @@
             ],
             "description": "Symfony Process Component",
             "homepage": "https://symfony.com",
-            "time": "2018-05-16T08:49:21+00:00"
+            "time": "2018-05-30T04:24:30+00:00"
         },
         {
             "name": "symfony/stopwatch",
-            "version": "v3.4.10",
+            "version": "v3.4.12",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/stopwatch.git",
@@ -1934,7 +1934,7 @@
         },
         {
             "name": "symfony/yaml",
-            "version": "v3.4.10",
+            "version": "v3.4.12",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
diff --git a/docs/Model/SendTransacSms.md b/docs/Model/SendTransacSms.md
index 33f11fb5..adc80cde 100644
--- a/docs/Model/SendTransacSms.md
+++ b/docs/Model/SendTransacSms.md
@@ -5,7 +5,7 @@ Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
 **sender** | **string** | Name of the sender. Only alphanumeric characters. No more than 11 characters | 
 **recipient** | **string** | Mobile number to send SMS with the country code | 
-**content** | **string** | Content of the message. If more than 160 characters long, multiple text messages will be sent | 
+**content** | **string** | Content of the message. If more than 160 characters long, will be sent as multiple text messages | 
 **type** | **string** | Type of the SMS | [optional] [default to 'transactional']
 **tag** | **string** | Tag of the message | [optional] 
 **webUrl** | **string** | Webhook to call for each event triggered by the message (delivered etc.) | [optional] 
diff --git a/lib/Model/SendTransacSms.php b/lib/Model/SendTransacSms.php
index cd07c0bb..09339af3 100644
--- a/lib/Model/SendTransacSms.php
+++ b/lib/Model/SendTransacSms.php
@@ -247,10 +247,6 @@ public function listInvalidProperties()
         if ($this->container['content'] === null) {
             $invalidProperties[] = "'content' can't be null";
         }
-        if ((strlen($this->container['content']) > 160)) {
-            $invalidProperties[] = "invalid value for 'content', the character length must be smaller than or equal to 160.";
-        }
-
         $allowedValues = $this->getTypeAllowableValues();
         if (!in_array($this->container['type'], $allowedValues)) {
             $invalidProperties[] = sprintf(
@@ -283,9 +279,6 @@ public function valid()
         if ($this->container['content'] === null) {
             return false;
         }
-        if (strlen($this->container['content']) > 160) {
-            return false;
-        }
         $allowedValues = $this->getTypeAllowableValues();
         if (!in_array($this->container['type'], $allowedValues)) {
             return false;
@@ -359,16 +352,12 @@ public function getContent()
     /**
      * Sets content
      *
-     * @param string $content Content of the message. If more than 160 characters long, multiple text messages will be sent
+     * @param string $content Content of the message. If more than 160 characters long, will be sent as multiple text messages
      *
      * @return $this
      */
     public function setContent($content)
     {
-        if ((strlen($content) > 160)) {
-            throw new \InvalidArgumentException('invalid length for $content when calling SendTransacSms., must be smaller than or equal to 160.');
-        }
-
         $this->container['content'] = $content;
 
         return $this;