diff --git a/CHANGELOG.md b/CHANGELOG.md
index fe7e780..5ea7a52 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@ All notable changes to `netgsm` will be documented in this file
 
 ## Unreleased
 
+## [4.1.0] - 2021-06-01
+
+- Bulk address adding support added to IYS.
+
 ## [4.0.0] - 2021-04-26
 
 - IYS integration (add, search) added.
diff --git a/README.md b/README.md
index 3e5ba06..1fc5627 100755
--- a/README.md
+++ b/README.md
@@ -348,6 +348,36 @@ $address->setRefId(999999)
 }
 ```
 
+#### Bulk Insert
+```php
+$address = new \TarfinLabs\Netgsm\Iys\Requests\Add();
+$address->setRefId(999999)
+        ->setSource('HS_WEB')
+        ->setRecipient('+905XXXXXXXXX')
+        ->setStatus('ONAY')
+        ->setConsentDate(now()->toDateTimeString())
+        ->setRecipientType('TACIR');
+
+$iys = \TarfinLabs\Netgsm\Netgsm::iys();
+$iys->addAddress($address->setType('MESAJ'));
+$iys->addAddress($address->setType('ARAMA'));
+$iys->send();
+```
+
+#### Response Paramaters for Bulk Insert
+```json
+{
+    "code": "0",
+    "error": "false",
+    "uid": "16116f5e-ae2a-4745-927a-xxxxxxxxxxx",
+    "erroritem": {
+        "1": {
+            "recipient": "Telefon numarası 13 karakter ve numerik olmalıdır.+9xxxx"
+        }
+    }
+}
+```
+
 #### Search Address
 
 This service is used to search a phone number or email address on IYS using NetGsm IYS service.
diff --git a/src/Iys/AbstractNetgsmIys.php b/src/Iys/AbstractNetgsmIys.php
index c7c7533..c882f9c 100644
--- a/src/Iys/AbstractNetgsmIys.php
+++ b/src/Iys/AbstractNetgsmIys.php
@@ -30,9 +30,7 @@ public function send(): string
                     'brandCode' => $this->credentials['brand_code'],
                 ],
                 'body'      => [
-                    'data'      => [
-                        $this->body,
-                    ],
+                    'data'      => $this->body,
                 ],
             ],
         ]);
diff --git a/src/Iys/NetgsmIys.php b/src/Iys/NetgsmIys.php
index a8dde89..97d346f 100644
--- a/src/Iys/NetgsmIys.php
+++ b/src/Iys/NetgsmIys.php
@@ -16,7 +16,7 @@ class NetgsmIys extends AbstractNetgsmIys
     public function addAddress(Add $request): NetgsmIys
     {
         $this->url = $request->getUrl();
-        $this->body = $request->body();
+        $this->body[] = $request->body();
         $this->method = 'POST';
 
         return $this;
@@ -31,7 +31,7 @@ public function addAddress(Add $request): NetgsmIys
     public function searchAddress(Search $request): NetgsmIys
     {
         $this->url = $request->getUrl();
-        $this->body = $request->body();
+        $this->body = [$request->body()];
         $this->method = 'POST';
 
         return $this;