diff --git a/.travis.yml b/.travis.yml
index d0e7520a..adb94061 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,9 +8,6 @@ env:
     - TEST_SUITE=samples
 
 php:
-    - 5.6
-    - 7.0
-    - 7.1
     - 7.2
     - 7.3
     - 7.4
diff --git a/composer.json b/composer.json
index e7e50bc8..ed0f9da6 100644
--- a/composer.json
+++ b/composer.json
@@ -6,7 +6,7 @@
     "license": "proprietary",
     "homepage": "http://developer.authorize.net",
     "require": {
-        "php": ">=5.6",
+        "php": ">=7.2",
         "ext-curl": "*",
         "ext-json": "*"
     },
diff --git a/tests/Controller_Test.php b/tests/Controller_Test.php
index 7cdb3546..a5ab7599 100644
--- a/tests/Controller_Test.php
+++ b/tests/Controller_Test.php
@@ -46,7 +46,7 @@ public function testARBGetSubscriptionList()
 
         $this->assertEquals("Ok", $response->getMessages()->getResultCode());
         $this->assertEquals($response->getRefId(), $refId);
-        $this->assertTrue(0 < count($response->getMessages()));
+        $this->assertNotNull($response->getMessages());
         foreach ($response->getMessages() as $message)
         {
             $this->assertEquals("I00001", $message->getCode());
@@ -79,7 +79,7 @@ public function testARBGetSubscription()
 
         $this->assertEquals("Ok", $response->getMessages()->getResultCode());
         $this->assertEquals($response->getRefId(), $refId);
-        $this->assertTrue(0 < count($response->getMessages()));
+        $this->assertNotNull($response->getMessages());
 
         foreach ($response->getMessages() as $message)
         {
@@ -124,7 +124,7 @@ public function testGetCustomerPaymentProfileList()
 
         $this->assertEquals("Ok", $response->getMessages()->getResultCode());
         $this->assertEquals($response->getRefId(), $refId);
-        $this->assertTrue(0 < count($response->getMessages()));
+        $this->assertNotNull($response->getMessages());
 
         foreach ($response->getMessages() as $message)
         {
@@ -173,7 +173,7 @@ public function testDecryptPaymentData()
 
         $this->assertEquals("Ok", $response->getMessages()->getResultCode());
         //$this->assertEquals($response->getRefId(), $refId);
-        $this->assertTrue(0 < count($response->getMessages()));
+        $this->assertNotNull($response->getMessages());
         foreach ($response->getMessages() as $message)
         {
             $this->assertEquals("I00001", $message->getCode());
diff --git a/tests/net/authorize/api/controller/CreateTransactionControllerTest.php b/tests/net/authorize/api/controller/CreateTransactionControllerTest.php
index e6af892e..9f1e5619 100644
--- a/tests/net/authorize/api/controller/CreateTransactionControllerTest.php
+++ b/tests/net/authorize/api/controller/CreateTransactionControllerTest.php
@@ -44,7 +44,7 @@ public function testCreateTransactionCreditCard()
         }
         $this->assertEquals("Ok", $response->getMessages()->getResultCode());
         $this->assertEquals( $this->refId, $response->getRefId());
-        $this->assertTrue(0 < count($response->getMessages()));
+        $this->assertNotNull($response->getMessages());
         foreach ($response->getMessages() as $message)
         {
             $this->assertEquals("I00001", $message->getCode());
@@ -88,7 +88,7 @@ public function testCreateTransactionPayPal()
         else
         {
             $this->assertEquals("Ok", $response->getMessages()->getResultCode());
-            $this->assertTrue(0 < count($response->getMessages()));
+            $this->assertNotNull($response->getMessages());
             foreach ($response->getMessages() as $message)
             {
                 $this->assertEquals("I00001", $message->getCode());
diff --git a/tests/net/authorize/api/controller/LogoutControllerTest.php b/tests/net/authorize/api/controller/LogoutControllerTest.php
index 284cb53c..fde033fd 100644
--- a/tests/net/authorize/api/controller/LogoutControllerTest.php
+++ b/tests/net/authorize/api/controller/LogoutControllerTest.php
@@ -26,7 +26,7 @@ public function testLogout()
 
         $this->assertEquals("Ok", $response->getMessages()->getResultCode());
         $this->assertEquals( $this->refId, $response->getRefId());
-        $this->assertTrue(0 < count($response->getMessages()));
+        $this->assertNotNull($response->getMessages());
         foreach ($response->getMessages() as $message)
         {
             $this->assertEquals("I00001", $message->getCode());