diff --git a/src/Http/CurlClient.php b/src/Http/CurlClient.php
index 11a9223..875c996 100644
--- a/src/Http/CurlClient.php
+++ b/src/Http/CurlClient.php
@@ -12,6 +12,13 @@
 class CurlClient implements ClientInterface
 {
 
+    /**
+     * The HTTP version tp be used.
+     *
+     * @var int $httpVersion
+     */
+    public static $httpVersion = null;
+
     /**
      * Send the request to the target URL.
      *
@@ -41,6 +48,9 @@ public function send(HttpMessage $message)
         curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
         curl_setopt($ch, CURLINFO_HEADER_OUT, true);
         curl_setopt($ch, CURLOPT_HEADER, true);
+        if (!empty(self::$httpVersion)) {
+            curl_setopt($ch, CURLOPT_HTTP_VERSION, self::$httpVersion);
+        }
         $chResp = curl_exec($ch);
         $message->requestHeaders = trim(str_replace("\r\n", "\n", curl_getinfo($ch, CURLINFO_HEADER_OUT)));
         $chResp = str_replace("\r\n", "\n", $chResp);