diff --git a/Classes/Domain/Api/Client/Solr/Core.php b/Classes/Domain/Api/Client/Solr/Core.php
index ee0bf51..2c3dc0c 100644
--- a/Classes/Domain/Api/Client/Solr/Core.php
+++ b/Classes/Domain/Api/Client/Solr/Core.php
@@ -46,6 +46,11 @@ class Core
      */
     protected $solrVersion;
 
+    /**
+     * @var string (e.g. ext-6.1)
+     */
+    protected $variant;
+
     /**
      * @var string (e.g. typo3)
      */
@@ -85,12 +90,13 @@ class Core
      * @param null $password
      * @param string $host
      */
-    public function __construct($name, $system = 'typo3', $schema = 'english', $solrVersion = '4.8', $id = null, \DateTime $createdAt = null, \DateTime $updateAt = null, $userId = null, $isActivated = false, $internalName = null, $password = null, $host = '')
+    public function __construct($name, $system = 'typo3', $schema = 'english', $solrVersion = '4.8', $variant, $id = null, \DateTime $createdAt = null, \DateTime $updateAt = null, $userId = null, $isActivated = false, $internalName = null, $password = null, $host = '')
     {
         $this->name = $name;
         $this->system = $system;
         $this->schema = $schema;
         $this->solrVersion = $solrVersion;
+        $this->variant = $variant;
         $this->id = $id;
         $this->createdAt = $createdAt;
         $this->updatedAt = $updateAt;
@@ -165,6 +171,14 @@ public function getSolrVersion()
         return $this->solrVersion;
     }
 
+    /**
+     * @return string
+     */
+    public function getVariant()
+    {
+        return $this->variant;
+    }
+
     /**
      * @return string
      */
diff --git a/Classes/Domain/Api/Client/Solr/CoreBuilder.php b/Classes/Domain/Api/Client/Solr/CoreBuilder.php
index cdfd35b..1ef77da 100644
--- a/Classes/Domain/Api/Client/Solr/CoreBuilder.php
+++ b/Classes/Domain/Api/Client/Solr/CoreBuilder.php
@@ -13,11 +13,6 @@
 class CoreBuilder
 {
 
-    /**
-     * @var string
-     */
-    protected static $coreClassName = Core::class;
-
     /**
      * @param $name
      * @param string $system
@@ -33,11 +28,11 @@ class CoreBuilder
      * @param string $host
      * @return Core
      */
-    public static function buildFromScalarValues($name, $system = 'typo3', $schema = 'english', $solrVersion = '4.8', $id = null, $createdAt = '', $updatedAt = '', $userId = null, $isActivated = false, $internalName = null, $password = null, $host = '')
+    public static function buildFromScalarValues($name, $system = 'typo3', $schema = 'english', $solrVersion = '4.8', $variant, $id = null, $createdAt = '', $updatedAt = '', $userId = null, $isActivated = false, $internalName = null, $password = null, $host = '')
     {
         $createdAt  = new \DateTime($createdAt, new \DateTimeZone("UTC"));
         $updatedAt  = new \DateTime($updatedAt, new \DateTimeZone("UTC"));
-        $core       = new self::$coreClassName($name, $system, $schema, $solrVersion, $id, $createdAt, $updatedAt, $userId, $isActivated, $internalName, $password, $host);
+        $core       = new Core($name, $system, $schema, $solrVersion, $variant, $id, $createdAt, $updatedAt, $userId, $isActivated, $internalName, $password, $host);
 
         return $core;
     }
diff --git a/Classes/Domain/Api/Service.php b/Classes/Domain/Api/Service.php
index e588c71..b9bb6d4 100644
--- a/Classes/Domain/Api/Service.php
+++ b/Classes/Domain/Api/Service.php
@@ -59,7 +59,10 @@ public function deleteCore(Core $core)
     }
 
     /**
+     * Deletes core by given identifier
+     *
      * @param integer $id
+     * @return bool
      */
     public function deleteCoreById($id)
     {
@@ -77,13 +80,13 @@ public function deleteCoreById($id)
      * @throws \InvalidArgumentException
      * @return boolean
      */
-    public function createNewCore($name, $system = 'typo3', $solrVersion = '4.8', $schema = 'english')
+    public function createNewCore($name, $system = 'typo3', $solrVersion = '4.8', $schema = 'english', $variant = 'ext-6.1')
     {
         if(trim($name) === '') {
             throw new \InvalidArgumentException('Can not create a core without passing a name');
         }
 
-        $coreToCreate = CoreBuilder::buildFromScalarValues($name, $system, $schema, $solrVersion);
+        $coreToCreate = CoreBuilder::buildFromScalarValues($name, $system, $schema, $solrVersion, $variant);
         return $this->coreRepository->add($coreToCreate);
     }
 
diff --git a/Classes/System/StorageBackend/CoreRestStorageBackend.php b/Classes/System/StorageBackend/CoreRestStorageBackend.php
index 1d25851..b1de854 100644
--- a/Classes/System/StorageBackend/CoreRestStorageBackend.php
+++ b/Classes/System/StorageBackend/CoreRestStorageBackend.php
@@ -74,6 +74,7 @@ public function findAll()
                 $apiCore->system,
                 $apiCore->schema,
                 $apiCore->solr_version,
+                $apiCore->variant,
                 $apiCore->id,
                 $apiCore->created_at,
                 $apiCore->updated_at,
@@ -102,6 +103,7 @@ public function add(Core $solrCore)
                     '&solr_core[solr_version]='. $solrCore->getSolrVersion() .
                     '&solr_core[system]=' . $solrCore->getSystem() .
                     '&solr_core[schema]=' . $solrCore->getSchema() .
+                    '&solr_core[variant]=' . $solrCore->getVariant() .
                     '&';
         $url = $this->addApiSecretAndToken($url);
         $response = $this->httpClient->post($url);
diff --git a/Tests/Build/cibuild.sh b/Tests/Build/cibuild.sh
index dc9c95e..13e2ea8 100755
--- a/Tests/Build/cibuild.sh
+++ b/Tests/Build/cibuild.sh
@@ -5,7 +5,7 @@ ROOTPATH="$SCRIPTPATH/../../"
 php-cs-fixer --version > /dev/null 2>&1
 if [ $? -eq "0" ]; then
     echo "Check PSR-2 compliance"
-    php-cs-fixer fix -v --level=psr2 --dry-run Classes
+    php-cs-fixer fix --diff --verbose --dry-run --rules='{"function_declaration": {"closure_function_spacing": "none"}}' Classes
 
     if [ $? -ne "0" ]; then
         echo "Some files are not PSR-2 compliant"
diff --git a/Tests/Unit/System/StorageBackend/CoreRestStorageBackendTest.php b/Tests/Unit/System/StorageBackend/CoreRestStorageBackendTest.php
index 429fcf5..d4ffce0 100644
--- a/Tests/Unit/System/StorageBackend/CoreRestStorageBackendTest.php
+++ b/Tests/Unit/System/StorageBackend/CoreRestStorageBackendTest.php
@@ -80,10 +80,10 @@ public function canThrowExceptionWhenGetRequestWasNotSuccessful()
      */
     public function canAddAValidCore()
     {
-        $core = new Core('testcore', 'typo3', 'english', '4.8');
+        $core = new Core('testcore', 'typo3', 'english', '4.8', 'ext-3.0');
         $responseMock = $this->getMock(Response::class, array('getBody', 'getStatusCode'), array(), '', false);
         $responseMock->expects($this->any())->method('getStatusCode')->will($this->returnValue(201));
-        $expectedPostEndpoint = 'https://myendpoint.com/api/solr_cores.json?solr_core[name]=testcore&solr_core[solr_version]=4.8&solr_core[system]=typo3&solr_core[schema]=english&api_token=foo&secret_token=bar';
+        $expectedPostEndpoint = 'https://myendpoint.com/api/solr_cores.json?solr_core[name]=testcore&solr_core[solr_version]=4.8&solr_core[system]=typo3&solr_core[schema]=english&solr_core[variant]=ext-3.0&api_token=foo&secret_token=bar';
         $this->httpClientMock->expects($this->once())->method('post')->with($expectedPostEndpoint)->will($this->returnValue($responseMock));
 
         $result = $this->coreRestStorageBackend->add($core);
@@ -95,7 +95,7 @@ public function canAddAValidCore()
      */
     public function canRemoveAValidCore()
     {
-        $core = new Core('testcore', 'typo3', 'english', '4.8', 1);
+        $core = new Core('testcore', 'typo3', 'english', '4.8', 'ext-3.0', 1);
         $responseMock = $this->getMock(Response::class, array('getBody', 'getStatusCode'), array(), '', false);
         $responseMock->expects($this->any())->method('getStatusCode')->will($this->returnValue(204));
         $expectedDeleteEndpoint = 'https://myendpoint.com/api/solr_cores/1.json?api_token=foo&secret_token=bar';
diff --git a/Tests/Unit/System/StorageBackend/Fixtures/getResponseWithMultipleCores.json b/Tests/Unit/System/StorageBackend/Fixtures/getResponseWithMultipleCores.json
index bd8ae4a..66df760 100644
--- a/Tests/Unit/System/StorageBackend/Fixtures/getResponseWithMultipleCores.json
+++ b/Tests/Unit/System/StorageBackend/Fixtures/getResponseWithMultipleCores.json
@@ -6,6 +6,7 @@
         "updated_at":"2015-12-12T14:44:14.000+01:00",
         "user_id":281,
         "solr_version":"4.8",
+        "variant": "ext-3.0",
         "schema":"english",
         "internal_name":"fdsfsdsd-test-48",
         "password":"sasasasa",
@@ -20,6 +21,7 @@
         "updated_at":"2015-12-12T14:44:14.000+01:00",
         "user_id":281,
         "solr_version":"4.8",
+        "variant": "ext-3.0",
         "schema":"english",
         "internal_name":"fdfafsdfds-test-48",
         "password":"sasasasa",
diff --git a/composer.json b/composer.json
index 614b205..f799437 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
     },
     "require": {
         "php": ">=5.5.0",
-        "guzzlehttp/guzzle": "v6.1.1"
+        "guzzlehttp/guzzle": "^6.2.1"
     },
     "require-dev": {
         "phpunit/phpunit": "4.1.3",
diff --git a/composer.lock b/composer.lock
index b55422f..c396917 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,37 +4,39 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "hash": "552d6088c275ffd908cb35997b37af7d",
-    "content-hash": "bdd4173acd716ac09a73babeb0a68ab2",
+    "content-hash": "3af187a14c4272c7c900de5a521d8e81",
     "packages": [
         {
             "name": "guzzlehttp/guzzle",
-            "version": "6.1.1",
+            "version": "6.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "c6851d6e48f63b69357cbfa55bca116448140e0c"
+                "reference": "f4db5a78a5ea468d4831de7f0bf9d9415e348699"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/c6851d6e48f63b69357cbfa55bca116448140e0c",
-                "reference": "c6851d6e48f63b69357cbfa55bca116448140e0c",
+                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/f4db5a78a5ea468d4831de7f0bf9d9415e348699",
+                "reference": "f4db5a78a5ea468d4831de7f0bf9d9415e348699",
                 "shasum": ""
             },
             "require": {
-                "guzzlehttp/promises": "~1.0",
-                "guzzlehttp/psr7": "~1.1",
-                "php": ">=5.5.0"
+                "guzzlehttp/promises": "^1.0",
+                "guzzlehttp/psr7": "^1.4",
+                "php": ">=5.5"
             },
             "require-dev": {
                 "ext-curl": "*",
-                "phpunit/phpunit": "~4.0",
-                "psr/log": "~1.0"
+                "phpunit/phpunit": "^4.0 || ^5.0",
+                "psr/log": "^1.0"
+            },
+            "suggest": {
+                "psr/log": "Required for using the Log middleware"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "6.1-dev"
+                    "dev-master": "6.2-dev"
                 }
             },
             "autoload": {
@@ -67,32 +69,32 @@
                 "rest",
                 "web service"
             ],
-            "time": "2015-11-23 00:47:50"
+            "time": "2017-06-22T18:50:49+00:00"
         },
         {
             "name": "guzzlehttp/promises",
-            "version": "1.0.3",
+            "version": "v1.3.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/promises.git",
-                "reference": "b1e1c0d55f8083c71eda2c28c12a228d708294ea"
+                "reference": "a59da6cf61d80060647ff4d3eb2c03a2bc694646"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/promises/zipball/b1e1c0d55f8083c71eda2c28c12a228d708294ea",
-                "reference": "b1e1c0d55f8083c71eda2c28c12a228d708294ea",
+                "url": "https://api.github.com/repos/guzzle/promises/zipball/a59da6cf61d80060647ff4d3eb2c03a2bc694646",
+                "reference": "a59da6cf61d80060647ff4d3eb2c03a2bc694646",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.5.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "~4.0"
+                "phpunit/phpunit": "^4.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.0-dev"
+                    "dev-master": "1.4-dev"
                 }
             },
             "autoload": {
@@ -118,20 +120,20 @@
             "keywords": [
                 "promise"
             ],
-            "time": "2015-10-15 22:28:00"
+            "time": "2016-12-20T10:07:11+00:00"
         },
         {
             "name": "guzzlehttp/psr7",
-            "version": "1.2.1",
+            "version": "1.4.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/psr7.git",
-                "reference": "4d0bdbe1206df7440219ce14c972aa57cc5e4982"
+                "reference": "f5b8a8512e2b58b0071a7280e39f14f72e05d87c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/psr7/zipball/4d0bdbe1206df7440219ce14c972aa57cc5e4982",
-                "reference": "4d0bdbe1206df7440219ce14c972aa57cc5e4982",
+                "url": "https://api.github.com/repos/guzzle/psr7/zipball/f5b8a8512e2b58b0071a7280e39f14f72e05d87c",
+                "reference": "f5b8a8512e2b58b0071a7280e39f14f72e05d87c",
                 "shasum": ""
             },
             "require": {
@@ -147,7 +149,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.0-dev"
+                    "dev-master": "1.4-dev"
                 }
             },
             "autoload": {
@@ -167,29 +169,36 @@
                     "name": "Michael Dowling",
                     "email": "mtdowling@gmail.com",
                     "homepage": "https://github.com/mtdowling"
+                },
+                {
+                    "name": "Tobias Schultze",
+                    "homepage": "https://github.com/Tobion"
                 }
             ],
-            "description": "PSR-7 message implementation",
+            "description": "PSR-7 message implementation that also provides common utility methods",
             "keywords": [
                 "http",
                 "message",
+                "request",
+                "response",
                 "stream",
-                "uri"
+                "uri",
+                "url"
             ],
-            "time": "2015-11-03 01:34:55"
+            "time": "2017-03-20T17:10:46+00:00"
         },
         {
             "name": "psr/http-message",
-            "version": "1.0",
+            "version": "1.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/php-fig/http-message.git",
-                "reference": "85d63699f0dbedb190bbd4b0d2b9dc707ea4c298"
+                "reference": "f6561bf28d520154e4b0ec72be95418abe6d9363"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/http-message/zipball/85d63699f0dbedb190bbd4b0d2b9dc707ea4c298",
-                "reference": "85d63699f0dbedb190bbd4b0d2b9dc707ea4c298",
+                "url": "https://api.github.com/repos/php-fig/http-message/zipball/f6561bf28d520154e4b0ec72be95418abe6d9363",
+                "reference": "f6561bf28d520154e4b0ec72be95418abe6d9363",
                 "shasum": ""
             },
             "require": {
@@ -217,6 +226,7 @@
                 }
             ],
             "description": "Common interface for HTTP messages",
+            "homepage": "https://github.com/php-fig/http-message",
             "keywords": [
                 "http",
                 "http-message",
@@ -225,7 +235,7 @@
                 "request",
                 "response"
             ],
-            "time": "2015-05-04 20:22:00"
+            "time": "2016-08-06T14:39:51+00:00"
         }
     ],
     "packages-dev": [
@@ -281,7 +291,7 @@
                 "constructor",
                 "instantiate"
             ],
-            "time": "2015-06-14 21:17:01"
+            "time": "2015-06-14T21:17:01+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
@@ -343,7 +353,7 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2015-10-06 15:47:00"
+            "time": "2015-10-06T15:47:00+00:00"
         },
         {
             "name": "phpunit/php-file-iterator",
@@ -388,7 +398,7 @@
                 "filesystem",
                 "iterator"
             ],
-            "time": "2013-10-10 15:34:57"
+            "time": "2013-10-10T15:34:57+00:00"
         },
         {
             "name": "phpunit/php-text-template",
@@ -429,26 +439,34 @@
             "keywords": [
                 "template"
             ],
-            "time": "2015-06-21 13:50:34"
+            "time": "2015-06-21T13:50:34+00:00"
         },
         {
             "name": "phpunit/php-timer",
-            "version": "1.0.7",
+            "version": "1.0.9",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-timer.git",
-                "reference": "3e82f4e9fc92665fafd9157568e4dcb01d014e5b"
+                "reference": "3dcf38ca72b158baf0bc245e9184d3fdffa9c46f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/3e82f4e9fc92665fafd9157568e4dcb01d014e5b",
-                "reference": "3e82f4e9fc92665fafd9157568e4dcb01d014e5b",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/3dcf38ca72b158baf0bc245e9184d3fdffa9c46f",
+                "reference": "3dcf38ca72b158baf0bc245e9184d3fdffa9c46f",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.3"
+                "php": "^5.3.3 || ^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.0"
             },
             "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0-dev"
+                }
+            },
             "autoload": {
                 "classmap": [
                     "src/"
@@ -470,20 +488,20 @@
             "keywords": [
                 "timer"
             ],
-            "time": "2015-06-21 08:01:12"
+            "time": "2017-02-26T11:10:40+00:00"
         },
         {
             "name": "phpunit/php-token-stream",
-            "version": "1.4.8",
+            "version": "1.4.11",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-token-stream.git",
-                "reference": "3144ae21711fb6cac0b1ab4cbe63b75ce3d4e8da"
+                "reference": "e03f8f67534427a787e21a385a67ec3ca6978ea7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-token-stream/zipball/3144ae21711fb6cac0b1ab4cbe63b75ce3d4e8da",
-                "reference": "3144ae21711fb6cac0b1ab4cbe63b75ce3d4e8da",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-token-stream/zipball/e03f8f67534427a787e21a385a67ec3ca6978ea7",
+                "reference": "e03f8f67534427a787e21a385a67ec3ca6978ea7",
                 "shasum": ""
             },
             "require": {
@@ -519,7 +537,7 @@
             "keywords": [
                 "tokenizer"
             ],
-            "time": "2015-09-15 10:49:45"
+            "time": "2017-02-27T10:12:30+00:00"
         },
         {
             "name": "phpunit/phpunit",
@@ -593,7 +611,7 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2014-06-11 14:15:47"
+            "time": "2014-06-11T14:15:47+00:00"
         },
         {
             "name": "phpunit/phpunit-mock-objects",
@@ -649,26 +667,26 @@
                 "mock",
                 "xunit"
             ],
-            "time": "2015-10-02 06:51:40"
+            "time": "2015-10-02T06:51:40+00:00"
         },
         {
             "name": "sebastian/comparator",
-            "version": "1.2.0",
+            "version": "1.2.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/comparator.git",
-                "reference": "937efb279bd37a375bcadf584dec0726f84dbf22"
+                "reference": "2b7424b55f5047b47ac6e5ccb20b2aea4011d9be"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/comparator/zipball/937efb279bd37a375bcadf584dec0726f84dbf22",
-                "reference": "937efb279bd37a375bcadf584dec0726f84dbf22",
+                "url": "https://api.github.com/repos/sebastianbergmann/comparator/zipball/2b7424b55f5047b47ac6e5ccb20b2aea4011d9be",
+                "reference": "2b7424b55f5047b47ac6e5ccb20b2aea4011d9be",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.3.3",
                 "sebastian/diff": "~1.2",
-                "sebastian/exporter": "~1.2"
+                "sebastian/exporter": "~1.2 || ~2.0"
             },
             "require-dev": {
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