diff --git a/composer.json b/composer.json
index d8f8b35..283b5bb 100644
--- a/composer.json
+++ b/composer.json
@@ -18,10 +18,10 @@
     ],
     "require": {
         "php": ">=7.2",
+        "illuminate/events": "~6.0 || ~7.0 || ~8.0",
         "illuminate/notifications": "~6.0 || ~7.0 || ~8.0",
         "illuminate/support": "~6.0 || ~7.0 || ~8.0",
-        "illuminate/events": "~6.0 || ~7.0 || ~8.0",
-        "plivo/plivo-php": "^1.1"
+        "plivo/plivo-php": "^4.0"
     },
     "require-dev": {
         "mockery/mockery": "^1.3",
diff --git a/src/Plivo.php b/src/Plivo.php
index 7b0b8e0..99e54dc 100644
--- a/src/Plivo.php
+++ b/src/Plivo.php
@@ -2,7 +2,7 @@
 
 namespace NotificationChannels\Plivo;
 
-use Plivo\RestAPI as PlivoRestApi;
+use Plivo\RestClient as PlivoRestApi;
 
 class Plivo extends PlivoRestApi
 {
diff --git a/src/PlivoChannel.php b/src/PlivoChannel.php
index eb36c11..92f8a7f 100644
--- a/src/PlivoChannel.php
+++ b/src/PlivoChannel.php
@@ -48,11 +48,11 @@ public function send($notifiable, Notification $notification)
             $message = new PlivoMessage($message);
         }
 
-        $response = $this->plivo->send_message([
-            'src' => $message->from ?: $this->from,
-            'dst' => $to,
-            'text' => trim($message->content),
-        ]);
+        $response = $this->plivo->messages->create(
+            $message->from ?: $this->from,
+            [$to],
+            trim($message->content),
+        );
 
         if ($response['status'] !== 202) {
             throw CouldNotSendNotification::serviceRespondedWithAnError($response);