diff --git a/.travis.yml b/.travis.yml
index 87bbb1e67..de890615d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,8 @@ php:
   - 5.6
   - 7.0
   - 7.1
+  - 7.2
+  - 7.3
   - nightly
   - hhvm
 
diff --git a/tests/PsrResponseCommandTest.php b/tests/PsrResponseCommandTest.php
index 230d266ff..f7753f04a 100644
--- a/tests/PsrResponseCommandTest.php
+++ b/tests/PsrResponseCommandTest.php
@@ -45,10 +45,10 @@ public function testResponseCreationAndHeaders()
         $this->assertTrue($output->hasHeader('Content-Type'));
         $this->assertTrue($output->hasHeader('Content-Length'));
 
-        $this->assertEquals(
-            "application/xml",
-            $output->getHeaderLine('Content-Type')
-        );
+        $this->assertTrue(in_array($output->getHeaderLine('Content-Type'), [
+            'application/xml',
+            'text/xml',
+        ]));
 
         $this->assertEquals(
             strlen($encodedContent),