diff --git a/.travis.yml b/.travis.yml
index 84ba3b8..f4c0451 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,11 @@
 language: php
 
 php:
-    - 5.4
-    - 5.5
     - 5.6
+    - 7.0
+    - 7.1
+    - 7.2
+    - 7.3
 
 before_script:
     - composer install
diff --git a/composer.json b/composer.json
index 568a0a4..498f33d 100644
--- a/composer.json
+++ b/composer.json
@@ -9,11 +9,11 @@
         }
     ],
     "require": {
-        "php": ">=5.3.0",
+        "php": ">=5.6.0",
         "symfony/process": "~2.0|~3.0|~4.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "~3.7"
+        "phpunit/phpunit": "^5.7"
     },
     "autoload": {
         "psr-0": { "Nmap": "src/" }
diff --git a/tests/Nmap/Tests/NmapTest.php b/tests/Nmap/Tests/NmapTest.php
index 337bf43..f7fd519 100644
--- a/tests/Nmap/Tests/NmapTest.php
+++ b/tests/Nmap/Tests/NmapTest.php
@@ -258,7 +258,7 @@ public function testScanWithUserTimeout()
      */
     public function testExecutableNotExecutable()
     {
-        $executor = $this->getMock('Nmap\Util\ProcessExecutor');
+        $executor = $this->createMock('Nmap\Util\ProcessExecutor');
         $executor
             ->expects($this->once())
             ->method('execute')
@@ -272,7 +272,7 @@ public function testExecutableNotExecutable()
      */
     private function getProcessExecutorMock()
     {
-        $executor = $this->getMock('Nmap\Util\ProcessExecutor');
+        $executor = $this->createMock('Nmap\Util\ProcessExecutor');
         $executor
             ->expects($this->at(0))
             ->method('execute')