diff --git a/SqsConsumer.php b/SqsConsumer.php
index 04d5bbd..86e28f6 100644
--- a/SqsConsumer.php
+++ b/SqsConsumer.php
@@ -138,7 +138,7 @@ public function reject(Message $message, bool $requeue = false): void
                 '@region' => $this->queue->getRegion(),
                 'QueueUrl' => $this->context->getQueueUrl($this->queue),
                 'ReceiptHandle' => $message->getReceiptHandle(),
-                'VisibilityTimeout' => $message->getRequeueVisibilityTimeout(),
+                'VisibilityTimeout' => (string) $message->getRequeueVisibilityTimeout(),
             ]);
         } else {
             $this->context->getSqsClient()->deleteMessage([
@@ -165,7 +165,7 @@ protected function receiveMessage(int $timeoutSeconds): ?SqsMessage
         ];
 
         if ($this->visibilityTimeout) {
-            $arguments['VisibilityTimeout'] = $this->visibilityTimeout;
+            $arguments['VisibilityTimeout'] = (string) $this->visibilityTimeout;
         }
 
         $result = $this->context->getSqsClient()->receiveMessage($arguments);
diff --git a/SqsDestination.php b/SqsDestination.php
index 5649d30..bdad9f8 100644
--- a/SqsDestination.php
+++ b/SqsDestination.php
@@ -150,7 +150,7 @@ public function setVisibilityTimeout(int $seconds = null): void
         if (null == $seconds) {
             unset($this->attributes['VisibilityTimeout']);
         } else {
-            $this->attributes['VisibilityTimeout'] = $seconds;
+            $this->attributes['VisibilityTimeout'] = (string) $seconds;
         }
     }
 
diff --git a/Tests/SqsConsumerTest.php b/Tests/SqsConsumerTest.php
index 05fbb9b..b28a64e 100644
--- a/Tests/SqsConsumerTest.php
+++ b/Tests/SqsConsumerTest.php
@@ -208,7 +208,7 @@ public function testShouldRejectMessageAndRequeue()
                 '@region' => 'theRegion',
                 'QueueUrl' => 'theQueueUrl',
                 'ReceiptHandle' => 'theReceipt',
-                'VisibilityTimeout' => 0,
+                'VisibilityTimeout' => '0',
             ]))
         ;
 
@@ -248,7 +248,7 @@ public function testShouldRejectMessageAndRequeueWithVisibilityTimeout()
                 '@region' => 'theRegion',
                 'QueueUrl' => 'theQueueUrl',
                 'ReceiptHandle' => 'theReceipt',
-                'VisibilityTimeout' => 30,
+                'VisibilityTimeout' => '30',
             ]))
         ;
 
diff --git a/Tests/SqsDestinationTest.php b/Tests/SqsDestinationTest.php
index 724ce0c..a0a613e 100644
--- a/Tests/SqsDestinationTest.php
+++ b/Tests/SqsDestinationTest.php
@@ -79,7 +79,7 @@ public function testCouldSetVisibilityTimeoutAttribute()
         $destination = new SqsDestination('aDestinationName');
         $destination->setVisibilityTimeout(12345);
 
-        $this->assertSame(['VisibilityTimeout' => 12345], $destination->getAttributes());
+        $this->assertSame(['VisibilityTimeout' => '12345'], $destination->getAttributes());
     }
 
     public function testCouldSetFifoQueueAttributeAndUnsetIt()