diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0d3ddc6..9c12cca 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -47,4 +47,4 @@ jobs:
       - name: Run test suite
         run: composer run-script test
         env:
-          CASPER_PHP_SDK_TEST_NODE_URL: "65.21.237.160:7777"
+          CASPER_PHP_SDK_TEST_NODE_URL: "88.99.100.42:7777"
diff --git a/README.md b/README.md
index 631654a..f9c2fbf 100644
--- a/README.md
+++ b/README.md
@@ -31,10 +31,12 @@ extension=secp256k1.so
 
 ## Usage
 ### Creating RpcClient
-Create `RpcClient` by passing node url to constructor
+Create `RpcClient` by passing node url and headers (optional) to constructor
 ```php
 $nodeUrl = 'http://127.0.0.1:7777';
-$client = new Casper\Rpc\RpcClient($nodeUrl);
+$headers = array('Authorization' => 'Bearer 6ae6c8b31f09df244019ffef60c274e4'); // Optional
+
+$client = new Casper\Rpc\RpcClient($nodeUrl, $headers);
 ```
 
 ### RPC call examples
diff --git a/docs/API/RpcClientAPI.md b/docs/API/RpcClientAPI.md
index 715b5c7..0183165 100644
--- a/docs/API/RpcClientAPI.md
+++ b/docs/API/RpcClientAPI.md
@@ -4,12 +4,13 @@ Class for interacting with the network via RPC
 ---
 ## Constructor
 ```php
-__constructor(string $nodeUrl)
+__constructor(string $nodeUrl, array $headers = array())
 ```
 ### Parameters
-| Name | Type | Description | Required |
-|---|---|---|---|
-| `$nodeUrl` | `string` | Full node url string | Yes |
+| Name       | Type     | Description          | Required |
+|------------|----------|----------------------|----------|
+| `$nodeUrl` | `string` | Full node url string | Yes      |
+| `$headers` | `array`  | Additional headers   | No       |
 
 ---
 ## Put deploy
diff --git a/src/Rpc/RpcClient.php b/src/Rpc/RpcClient.php
index 734b4c5..d472785 100644
--- a/src/Rpc/RpcClient.php
+++ b/src/Rpc/RpcClient.php
@@ -67,11 +67,14 @@ class RpcClient
 
     private string $nodeUrl;
 
+    private array $headers;
+
     private ?string $lastApiVersion = null;
 
-    public function __construct(string $nodeUrl)
+    public function __construct(string $nodeUrl, array $headers = array())
     {
         $this->nodeUrl = $nodeUrl;
+        $this->headers = $headers;
     }
 
     public function getLastApiVersion(): ?string
@@ -461,20 +464,23 @@ private function rpcCallMethod(string $method, array $params = array()): array
     {
         $url = $this->nodeUrl . '/rpc';
         $curl = curl_init($url);
-        $data = array(
-            'id' => self::ID,
-            'jsonrpc' => self::JSON_RPC,
-            'method' => $method,
-            'params' => $params
-        );
+
+        $headers = ['Accept: application/json', 'Content-type: application/json'];
+        foreach ($this->headers as $name => $value) {
+            $headers[] = "$name: $value";
+        }
 
         curl_setopt($curl, CURLOPT_URL, $url);
         curl_setopt($curl, CURLOPT_POST, true);
         curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
-        curl_setopt($curl, CURLOPT_POSTFIELDS, json_encode($data));
-        curl_setopt($curl, CURLOPT_HTTPHEADER, array(
-            'Accept: application/json',
-            'Content-type: application/json',
+        curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
+        curl_setopt($curl, CURLOPT_POSTFIELDS, json_encode(
+            array(
+                'id' => self::ID,
+                'jsonrpc' => self::JSON_RPC,
+                'method' => $method,
+                'params' => $params
+            )
         ));
 
         $response = curl_exec($curl);