diff --git a/.travis.yml b/.travis.yml
index a241bf0..d9ba4ad 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,14 +12,12 @@ env:
         - SYMFONY_PHPUNIT_DIR=$HOME/.phpunit-bridge
         - SYMFONY_PHPUNIT_REMOVE='' # don't remove prophecy
 
-php: [7.2, 7.1, 7.0, 5.6, 5.5, 5.4]
+php: [7.2, 7.1]
 
 matrix:
     include:
         - php: 7.2
           env: COMPOSER_FLAGS='--prefer-lowest --prefer-stable'
-        - php: 5.3
-          dist: precise
         - php: 7.2
           env: STABILITY=dev
 
diff --git a/Tests/ProcessorTest.php b/Tests/ProcessorTest.php
index 4a1163d..1873830 100644
--- a/Tests/ProcessorTest.php
+++ b/Tests/ProcessorTest.php
@@ -17,7 +17,7 @@ class ProcessorTest extends TestCase
      */
     private $processor;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
@@ -25,7 +25,7 @@ protected function setUp()
         $this->processor = new Processor($this->io->reveal());
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         parent::tearDown();
 
diff --git a/Tests/ScriptHandlerTest.php b/Tests/ScriptHandlerTest.php
index 7430200..145dbd5 100644
--- a/Tests/ScriptHandlerTest.php
+++ b/Tests/ScriptHandlerTest.php
@@ -11,7 +11,7 @@ class ScriptHandlerTest extends TestCase
     private $io;
     private $package;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
diff --git a/composer.json b/composer.json
index f5e257b..a71adae 100644
--- a/composer.json
+++ b/composer.json
@@ -11,13 +11,13 @@
         }
     ],
     "require": {
-        "php": ">=5.3.3",
-        "symfony/yaml": "^2.3 || ^3.0 || ^4.0"
+        "php": ">=7.1",
+        "symfony/yaml": "^3.4 || ^4.2"
     },
     "require-dev": {
         "composer/composer": "^1.0@dev",
-        "symfony/filesystem": "^2.3 || ^3 || ^4",
-        "symfony/phpunit-bridge": "^4.0"
+        "symfony/filesystem": "^3.4 || ^4.2",
+        "symfony/phpunit-bridge": "^4.2"
     },
     "autoload": {
         "psr-4": { "Incenteev\\ParameterHandler\\": "" }