diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index d63aeaf..b1c8ebb 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -76,4 +76,4 @@ jobs:
                   composer-options: "--prefer-dist"
 
             - name: Run tests
-              run: vendor/bin/phpunit tests -v
+              run: vendor/bin/phpunit tests
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d28ed54..a655b55 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) a
 
 ## [Unreleased]
 
+### Added
+
+- Added support for Time to Live (TTL) parameter
+
 ## [1.3.2]
 
 ### Added
diff --git a/Example/CompleteNotificationExample.php b/Example/CompleteNotificationExample.php
index 0334460..8eb22db 100644
--- a/Example/CompleteNotificationExample.php
+++ b/Example/CompleteNotificationExample.php
@@ -44,6 +44,7 @@ public function completeNotification()
         $message->setUrlTitle("Example URL");
         $message->setisHtml(false);
         $message->setTimestamp(new \DateTime('now'));
+        $message->setTtl(60 * 60 * 24); // 1 day
         // assign priority to the notification
         $message->setPriority(new Priority(Priority::NORMAL));
 
diff --git a/README.md b/README.md
index c82d74f..c2e1286 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,7 @@ Light, simple and fast, yet comprehensive wrapper for the [Pushover](https://pus
   - Notification priority
   - Notification sound (including custom sound)
   - Message time
+  - Time to live
 - User/Group Validation API ([Example](Example/UserGroupValidationExample.php))
   - Validation by user or group key
   - Validation by user and device
diff --git a/src/Api/Message/Message.php b/src/Api/Message/Message.php
index 0761fab..5533ccb 100644
--- a/src/Api/Message/Message.php
+++ b/src/Api/Message/Message.php
@@ -84,6 +84,20 @@ class Message
      */
     private $timestamp;
 
+    /**
+     * Normally a message delivered to a device is retained on the device until it is deleted by the user,
+     * or is automatically deleted when the number of messages on the device exceeds the user's configured message limit.
+     * The ttl parameter specifies a Time to Live in seconds, after which the message will be automatically deleted from the devices it was delivered to.
+     * This can be useful for unimportant messages that have a limited usefulness after a short amount of time.
+     *
+     * The ttl parameter is ignored for messages with a priority value of 2.
+     *
+     * The ttl value must be a positive number of seconds, and is counted from the time the message is received by our API.
+     *
+     * @var int|null
+     */
+    private $ttl;
+
 
     public function __construct(string $message, string $title = null)
     {
@@ -223,4 +237,24 @@ public function setTimestamp(\DateTime $timestamp): void
     {
         $this->timestamp = $timestamp;
     }
+
+    /**
+     * @return int|null
+     */
+    public function getTtl(): ?int
+    {
+        return $this->ttl;
+    }
+
+    /**
+     * @param int|null $ttl
+     */
+    public function setTtl(?int $ttl): void
+    {
+        if ($ttl <= 0) {
+            throw new InvalidArgumentException('The ttl value of ' . $ttl . ' is invalid. The ttl value must be a positive number of seconds.');
+        }
+
+        $this->ttl = $ttl;
+    }
 }
diff --git a/src/Client/MessageClient.php b/src/Client/MessageClient.php
index 13a9d26..6e90e09 100644
--- a/src/Client/MessageClient.php
+++ b/src/Client/MessageClient.php
@@ -88,6 +88,10 @@ public function buildCurlPostFields(Notification $notification): array
             $curlPostFields['html'] = 1;
         }
 
+        if (null !== $notification->getMessage()->getTtl()) {
+            $curlPostFields['ttl'] = $notification->getMessage()->getTtl();
+        }
+
         if (null !== $notification->getSound()) {
             $curlPostFields['sound'] = $notification->getSound()->getSound();
         }
diff --git a/tests/Api/Message/MessageTest.php b/tests/Api/Message/MessageTest.php
index 9a19e34..540e1af 100644
--- a/tests/Api/Message/MessageTest.php
+++ b/tests/Api/Message/MessageTest.php
@@ -150,4 +150,40 @@ public function testGetTimestamp()
 
         $this->assertEquals($datetime->getTimestamp(), $message->getTimestamp());
     }
+
+    public function testGetTtl()
+    {
+        $message = new Message("This is a test message");
+
+        $message->setTtl(3600);
+
+        $this->assertEquals(3600, $message->getTtl());
+    }
+
+    public function testSetTtl()
+    {
+        $message = new Message("This is a test message");
+
+        $message->setTtl(3600);
+
+        $this->assertEquals(3600, $message->getTtl());
+    }
+
+    public function testSetNegativeTtl()
+    {
+        $message = new Message("This is a test message");
+
+        $this->expectException(InvalidArgumentException::class);
+
+        $message->setTtl(-1);
+    }
+
+    public function testSetZeroTtl()
+    {
+        $message = new Message("This is a test message");
+
+        $this->expectException(InvalidArgumentException::class);
+
+        $message->setTtl(0);
+    }
 }
diff --git a/tests/Client/MessageClientTest.php b/tests/Client/MessageClientTest.php
index a76fb57..353f67f 100644
--- a/tests/Client/MessageClientTest.php
+++ b/tests/Client/MessageClientTest.php
@@ -42,6 +42,7 @@ public function testBuildCurlPostFields()
         $message->setPriority(new Priority(Priority::EMERGENCY, 30, 300));
         $message->getPriority()->setCallback("https://callback.example.com");
         $message->setIsHtml(true);
+        $message->setTtl(60 * 60 * 24);
 
         $recipient->addDevice("ios");
         $recipient->addDevice("android");
@@ -65,6 +66,7 @@ public function testBuildCurlPostFields()
         $this->assertEquals("300", $curlPostFields['expire']);
         $this->assertEquals("https://callback.example.com", $curlPostFields['callback']);
         $this->assertEquals("1", $curlPostFields['html']);
+        $this->assertEquals("86400", $curlPostFields['ttl']);
         $this->assertEquals("pushover", $curlPostFields['sound']);
     }
 }