diff --git a/.travis.yml b/.travis.yml
index 02453ae..f2f4624 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,11 +1,10 @@
 language: php
 
 php:
-  - 5.4
-  - 5.5
   - 5.6
   - 7.0
   - 7.1
+  - 7.2
 
 before_script:
   - composer install -n --dev --prefer-source
diff --git a/composer.json b/composer.json
index c67c80f..df4bd47 100644
--- a/composer.json
+++ b/composer.json
@@ -26,10 +26,11 @@
         "psr-4": { "Omnipay\\Payflow\\" : "src/" }
     },
     "require": {
-        "omnipay/common": "~2.0"
+        "league/omnipay": "^3.0",
+        "squizlabs/php_codesniffer": "^3"
     },
     "require-dev": {
-        "omnipay/tests": "~2.0"
+        "omnipay/tests": "^3.0"
     },
     "extra": {
         "branch-alias": {
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index a35b736..535809e 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -14,9 +14,6 @@
             <directory>./tests/</directory>
         </testsuite>
     </testsuites>
-    <listeners>
-        <listener class="Mockery\Adapter\Phpunit\TestListener" file="vendor/mockery/mockery/library/Mockery/Adapter/Phpunit/TestListener.php" />
-    </listeners>
     <filter>
         <whitelist>
             <directory>./src</directory>
diff --git a/src/Message/AuthorizeRequest.php b/src/Message/AuthorizeRequest.php
index 127d3dc..688f7d1 100644
--- a/src/Message/AuthorizeRequest.php
+++ b/src/Message/AuthorizeRequest.php
@@ -282,13 +282,14 @@ public function getData()
 
     public function sendData($data)
     {
-        $httpResponse = $this->httpClient->post(
+        $httpResponse = $this->httpClient->request(
+            'POST',
             $this->getEndpoint(),
-            null,
+            [],
             $this->encodeData($data)
-        )->send();
+        );
 
-        return $this->response = new Response($this, $httpResponse->getBody());
+        return $this->response = new Response($this, $httpResponse->getBody()->getContents());
     }
 
     /**