diff --git a/lib/SparkPost/SparkPostResponse.php b/lib/SparkPost/SparkPostResponse.php
index 402a2b2..266ba63 100644
--- a/lib/SparkPost/SparkPostResponse.php
+++ b/lib/SparkPost/SparkPostResponse.php
@@ -2,6 +2,8 @@
 
 namespace SparkPost;
 
+use GuzzleHttp\Psr7\Stream;
+use Psr\Http\Message\MessageInterface;
 use Psr\Http\Message\ResponseInterface as ResponseInterface;
 use Psr\Http\Message\StreamInterface as StreamInterface;
 
@@ -43,80 +45,80 @@ public function getRequest()
      *
      * @return array $body - the json decoded body from the http response
      */
-    public function getBody()
+    public function getBody() : StreamInterface
     {
         $body = $this->response->getBody();
         $body_string = $body->__toString();
 
         $json = json_decode($body_string, true);
 
-        return $json;
+        return new Stream($json);
     }
 
     /**
      * pass these down to the response given in the constructor.
      */
-    public function getProtocolVersion()
+    public function getProtocolVersion() : string
     {
         return $this->response->getProtocolVersion();
     }
 
-    public function withProtocolVersion($version)
+    public function withProtocolVersion($version) : MessageInterface
     {
         return $this->response->withProtocolVersion($version);
     }
 
-    public function getHeaders()
+    public function getHeaders() : array
     {
         return $this->response->getHeaders();
     }
 
-    public function hasHeader($name)
+    public function hasHeader($name) : bool
     {
         return $this->response->hasHeader($name);
     }
 
-    public function getHeader($name)
+    public function getHeader($name) : array
     {
         return $this->response->getHeader($name);
     }
 
-    public function getHeaderLine($name)
+    public function getHeaderLine($name) : string
     {
         return $this->response->getHeaderLine($name);
     }
 
-    public function withHeader($name, $value)
+    public function withHeader($name, $value) : MessageInterface
     {
         return $this->response->withHeader($name, $value);
     }
 
-    public function withAddedHeader($name, $value)
+    public function withAddedHeader($name, $value) : MessageInterface
     {
         return $this->response->withAddedHeader($name, $value);
     }
 
-    public function withoutHeader($name)
+    public function withoutHeader($name) : MessageInterface
     {
         return $this->response->withoutHeader($name);
     }
 
-    public function withBody(StreamInterface $body)
+    public function withBody(StreamInterface $body) : MessageInterface
     {
         return $this->response->withBody($body);
     }
 
-    public function getStatusCode()
+    public function getStatusCode() : int
     {
         return $this->response->getStatusCode();
     }
 
-    public function withStatus($code, $reasonPhrase = '')
+    public function withStatus($code, $reasonPhrase = '') : ResponseInterface
     {
         return $this->response->withStatus($code, $reasonPhrase);
     }
 
-    public function getReasonPhrase()
+    public function getReasonPhrase() : string
     {
         return $this->response->getReasonPhrase();
     }