diff --git a/composer.json b/composer.json
index 68c619b..c92dbec 100644
--- a/composer.json
+++ b/composer.json
@@ -16,11 +16,12 @@
         }
     ],
     "require": {
-        "php": "~7.0",
+        "php": "^7.0 || ^8.0",
         "guzzlehttp/guzzle-services": "^1.0",
-        "psr/container": "^1.0",
+        "psr/container": "^2.0",
         "psr/http-message": "^1.0",
-        "laminas/laminas-diactoros": "^1.3 || ^2.0"
+        "laminas/laminas-diactoros": "^1.3 || ^2.0",
+        "ext-json": "*"
     },
     "require-dev": {
         "phpunit/phpunit": "^6.0",
diff --git a/src/ShopifyClient.php b/src/ShopifyClient.php
index 2ceb984..0186440 100644
--- a/src/ShopifyClient.php
+++ b/src/ShopifyClient.php
@@ -410,7 +410,10 @@ class ShopifyClient
     public function __construct(array $connectionOptions, GuzzleClient $guzzleClient = null, array $guzzleMiddleware = [])
     {
         $this->validateConnectionOptions($connectionOptions);
-        $this->connectionOptions = $connectionOptions;
+        $this->connectionOptions = array_merge([
+            "use_retry_decider" => true,
+            "max_retries"       => 5,
+        ], $connectionOptions);
 
         $this->guzzleClient = $guzzleClient ?? $this->createDefaultClient($guzzleMiddleware);
     }
@@ -514,7 +517,7 @@ public function wrapRequestData(CommandInterface $command): RequestInterface
 
         if (($method === 'post' || $method === 'put') && $rootKey !== null) {
             $newBody = [$rootKey => json_decode($request->getBody()->getContents(), true)];
-            $request = $request->withBody(Psr7\stream_for(json_encode($newBody)));
+            $request = $request->withBody(Psr7\Utils::streamFor(json_encode($newBody)));
         }
 
         return $request;
@@ -533,7 +536,8 @@ public function wrapRequestData(CommandInterface $command): RequestInterface
     public function retryDecider(int $retries, RequestInterface $request, ResponseInterface $response = null, ClientExceptionInterface $exception = null): bool
     {
         // Limit the number of retries to 5
-        if ($retries >= 5) {
+        $max_retries = $this->connectionOptions["max_retries"];
+        if ($retries >= $max_retries) {
             return false;
         }
 
@@ -595,14 +599,16 @@ private function createDefaultClient(array $guzzleMiddleware = []): GuzzleClient
         $baseUri = 'https://' . str_replace('.myshopify.com', '', $this->connectionOptions['shop']) . '.myshopify.com';
 
         $handlerStack = HandlerStack::create(new CurlHandler());
-        $handlerStack->push(Middleware::retry([$this, 'retryDecider'], [$this, 'retryDelay']));
+        if ($this->connectionOptions["use_retry_decider"]) {
+            $handlerStack->push($this->getRetryDecider());
+        }
 
         foreach ($guzzleMiddleware as $curMiddleware) {
             $handlerStack->push($curMiddleware);
         }
 
         $httpClient  = new Client(['base_uri' => $baseUri, 'handler' => $handlerStack]);
-        $description = new Description(require __DIR__ . '/ServiceDescription/Shopify-v1.php');
+        $description = new Description($this->getServiceDescription());
 
         return new GuzzleClient($httpClient, $description, [$this, 'wrapRequestData']);
     }
@@ -691,4 +697,12 @@ private function getRequestAuthorizationArguments(): array
             ];
         }
     }
+
+    public function getRetryDecider() {
+        return Middleware::retry([$this, 'retryDecider'], [$this, 'retryDelay']);
+    }
+
+    public function getServiceDescription() : array {
+        return require __DIR__ . '/ServiceDescription/Shopify-v1.php';
+    }
 }