diff --git a/.travis.yml b/.travis.yml
index b004e07..3cd7176 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,26 +4,16 @@ language: php
 sudo: false
 
 env:
-    - NETTE=2.1
-    - NETTE=2.2
-    - NETTE=2.3
     - NETTE=2.4
     - NETTE=master
 
 php:
-    - 5.4
-    - 5.5
     - 5.6
     - 7.0
     - 7.1
     - hhvm
 
 matrix:
-    exclude:
-        - php: 5.4
-          env: NETTE=2.4
-        - php: 5.5
-          env: NETTE=2.4
     allow_failures:
         - php: hhvm
 
@@ -42,4 +32,4 @@ after_failure:
 
 cache:
   directories:
-    - $HOME/.composer/cache
\ No newline at end of file
+    - $HOME/.composer/cache
diff --git a/composer.json b/composer.json
index ac7c6ee..fdfa9e7 100644
--- a/composer.json
+++ b/composer.json
@@ -16,33 +16,16 @@
 		"source": "https://github.com/skaut/SkautisNette"
 	},
 	"require": {
-		"php": ">=5.3.0",
+		"php": ">=5.6",
 		"skautis/skautis": "~2.0@dev",
-		"nette/di": "~2.1@dev",
-		"nette/http": "~2.1@dev"
+		"nette/di": "^2.4@dev",
+		"nette/http": "^2.4@dev",
+		"nette/utils": "^2.4@dev"
 	},
 	"require-dev": {
 		"nette/tester": "~1.3",
-		"nette/nette": "~2.1@dev",
-		"nette/application": "~2.1@dev",
-		"nette/bootstrap": "~2.1@dev",
-		"nette/caching": "~2.1@dev",
-		"nette/component-model": "~2.1@dev",
-		"nette/database": "~2.1@dev",
-		"nette/deprecated": "~2.1@dev",
-		"nette/finder": "~2.1@dev",
-		"nette/forms": "~2.1@dev",
-		"nette/mail": "~2.1@dev",
-		"nette/neon": "~2.1@dev",
-		"nette/php-generator": "~2.1@dev",
-		"nette/reflection": "~2.1@dev",
-		"nette/robot-loader": "~2.1@dev",
-		"nette/safe-stream": "~2.1@dev",
-		"nette/security": "~2.1@dev",
-		"nette/tokenizer": "~2.1@dev",
-		"nette/utils": "~2.1@dev",
-		"latte/latte": "~2.1@dev",
-		"tracy/tracy": "~2.1@dev"
+		"nette/nette": "^2.4@dev",
+		"nette/utils": "^2.4@dev"
 	},
     "suggest": {
         "tracy/tracy": "to enable skautis panel for Tracy debug bar.",
diff --git a/src/SkautisExtension.php b/src/SkautisExtension.php
index 3651a9a..042c2e5 100644
--- a/src/SkautisExtension.php
+++ b/src/SkautisExtension.php
@@ -4,6 +4,8 @@
 
 use Nette;
 use Nette\DI\Config;
+use Skautis;
+use Tracy\Debugger;
 
 
 /**
@@ -16,13 +18,13 @@ class SkautisExtension extends Nette\DI\CompilerExtension
 {
 
 	/** @var array */
-	public $defaults = array(
+	public $defaults = [
 		'applicationId' => NULL,
 		'testMode' => FALSE,
 		'profiler' => NULL,
 		'cache' => TRUE,
 		'compression' => TRUE,
-	);
+	];
 
 
 	public function loadConfiguration()
@@ -32,66 +34,28 @@ public function loadConfiguration()
 		$config['profiler'] = isset($config['profiler']) ? $config['profiler'] : !empty($container->parameters['debugMode']);
 
 		$container->addDefinition($this->prefix('config'))
-			->setClass('Skautis\Config', array($config['applicationId'], $config['testMode'], $config['cache'], $config['compression']));
+			->setClass(Skautis\Config::class, array($config['applicationId'], $config['testMode'], $config['cache'], $config['compression']));
 
 		$container->addDefinition($this->prefix('webServiceFactory'))
-			->setClass('Skautis\Wsdl\WebServiceFactory');
+			->setClass(Skautis\Wsdl\WebServiceFactory::class);
 
 		$manager = $container->addDefinition($this->prefix('wsdlManager'))
-			->setClass('Skautis\Wsdl\WsdlManager');
+			->setClass(Skautis\Wsdl\WsdlManager::class);
 
 		$container->addDefinition($this->prefix('session'))
-			->setClass('Skautis\Nette\SessionAdapter');
+			->setClass(SessionAdapter::class);
 
 		$container->addDefinition($this->prefix('user'))
-			->setClass('Skautis\User');
+			->setClass(Skautis\User::class);
 
 		$container->addDefinition($this->prefix('skautis'))
-			->setClass('Skautis\Skautis');
+			->setClass(Skautis\Skautis::class);
 
-		if ($config['profiler'] && (class_exists('Tracy\Debugger') || class_exists('Nette\Diagnostics\Debugger'))) {
+		if ($config['profiler'] && class_exists(Debugger::class)) {
 			$panel = $container->addDefinition($this->prefix('panel'))
-				->setClass('Skautis\Nette\Tracy\Panel');
-			$manager->addSetup(array($panel, 'register'), array($manager));
+				->setClass(Skautis\Nette\Tracy\Panel::class);
+			$manager->addSetup([$panel, 'register'], array($manager));
 		}
 	}
 
-
-	/**
-	 * BC with nette/di <2.3
-	 * @param string $name
-	 * @param array $args
-	 * @return mixed
-	 */
-	public function __call($name, $args)
-	{
-		if ($name === 'validateConfig') {
-			return call_user_func_array(array($this, '_validateConfig'), $args);
-		}
-		return parent::__call($name, $args);
-	}
-
-
-	/**
-	 * Checks whether $config contains only $expected items and returns combined array.
-	 * BC with nette/di <2.3
-	 * @param array $expected configuration keys
-	 * @param array|NULL $config to validate
-	 * @param string|NULL $name configuration section name
-	 * @return array
-	 * @throws Nette\InvalidStateException
-	 */
-	private function _validateConfig(array $expected, array $config = NULL, $name = NULL)
-	{
-		if (func_num_args() === 1) {
-			$config = $this->config;
-		}
-		if ($extra = array_diff_key((array) $config, $expected)) {
-			$name = $name ?: $this->name;
-			$extra = implode(", $name.", array_keys($extra));
-			throw new Nette\InvalidStateException("Unknown configuration option $name.$extra.");
-		}
-		return Config\Helpers::merge($config, $expected);
-	}
-
 }
diff --git a/src/Tracy/Panel.php b/src/Tracy/Panel.php
index 3152fbe..27bf7ee 100644
--- a/src/Tracy/Panel.php
+++ b/src/Tracy/Panel.php
@@ -8,43 +8,22 @@
 use Skautis\Wsdl\WsdlManager;
 use Tracy;
 
-
-if (!interface_exists('Tracy\IBarPanel') && interface_exists('Nette\Diagnostics\IBarPanel')) {
-	// BC with Nette 2.1
-	class_alias('Nette\Diagnostics\IBarPanel', 'Tracy\IBarPanel');
-}
-
-
 /**
  * Skautis panel for Tracy.
  *
  * @author Hána František
  */
-class Panel extends Nette\Object implements Tracy\IBarPanel
+class Panel implements Tracy\IBarPanel
 {
+	use Nette\SmartObject;
 
 	/** @var string */
-	private $htmlPrefix;
-
-	/** @var string */
-	private $debuggerClass;
+	private $htmlPrefix = 'tracy';
 
 	/** @var array */
 	private $queries = array();
 
 
-	public function __construct()
-	{
-		if (!class_exists('Tracy\Debugger') && class_exists('Nette\Diagnostics\Debugger')) {
-			$this->htmlPrefix = 'nette';
-			$this->debuggerClass = 'Nette\Diagnostics\Debugger';
-		} else {
-			$this->htmlPrefix = 'tracy';
-			$this->debuggerClass = 'Tracy\Debugger';
-		}
-	}
-
-
 	/**
 	 * Registers event listener on WebService objects via WsdlManager
 	 *
@@ -54,7 +33,7 @@ public function register(WsdlManager $wsdlManager)
 	{
 		$wsdlManager->addWebServiceListener(WebService::EVENT_SUCCESS, array($this, 'logEvent'));
 		$wsdlManager->addWebServiceListener(WebService::EVENT_FAILURE, array($this, 'logEvent'));
-		call_user_func(array($this->debuggerClass, 'getBar'))->addPanel($this);
+		Tracy\Debugger::getBar()->addPanel($this);
 	}
 
 
@@ -136,7 +115,7 @@ protected function prepareTrace(array $trace)
 	 */
 	protected function dump($object)
 	{
-		return call_user_func(array($this->debuggerClass, 'dump'), $object, TRUE);
+		return Tracy\Debugger::dump($object, TRUE);
 	}
 
 
diff --git a/tests/SkautisNette/SkautisExtension.debug.phpt b/tests/SkautisNette/SkautisExtension.debug.phpt
index 0c0ddc3..9af72ed 100644
--- a/tests/SkautisNette/SkautisExtension.debug.phpt
+++ b/tests/SkautisNette/SkautisExtension.debug.phpt
@@ -1,6 +1,8 @@
 <?php
 
 use Tester\Assert;
+use Skautis\Skautis;
+use Skautis\Nette\Tracy\Panel;
 
 
 require __DIR__ . '/../bootstrap.php';
@@ -13,6 +15,6 @@ $configurator->addConfig(__DIR__ . '/files/config.neon');
 $container = $configurator->createContainer();
 
 Assert::false($container->isCreated('skautis.panel'));
-Assert::type('Skautis\Skautis', $container->getService('skautis.skautis'));
+Assert::type(Skautis::class, $container->getService('skautis.skautis'));
 Assert::true($container->isCreated('skautis.panel'));
-Assert::type('Skautis\Nette\Tracy\Panel', $container->getService('skautis.panel'));
+Assert::type(Panel::class, $container->getService('skautis.panel'));
diff --git a/tests/SkautisNette/SkautisExtension.production.phpt b/tests/SkautisNette/SkautisExtension.production.phpt
index 6fc0727..4a609fd 100644
--- a/tests/SkautisNette/SkautisExtension.production.phpt
+++ b/tests/SkautisNette/SkautisExtension.production.phpt
@@ -1,7 +1,7 @@
 <?php
 
 use Tester\Assert;
-
+use Skautis\Skautis;
 
 require __DIR__ . '/../bootstrap.php';
 
@@ -12,5 +12,5 @@ $configurator->setDebugMode(FALSE);
 $configurator->addConfig(__DIR__ . '/files/config.neon');
 $container = $configurator->createContainer();
 
-Assert::type('Skautis\Skautis', $container->getService('skautis.skautis'));
+Assert::type(Skautis::class, $container->getService('skautis.skautis'));
 Assert::false($container->hasService('skautis.panel'));
diff --git a/tests/composer-nette-2.1.json b/tests/composer-nette-2.1.json
deleted file mode 100644
index 0895b7e..0000000
--- a/tests/composer-nette-2.1.json
+++ /dev/null
@@ -1,33 +0,0 @@
-{
-	"name": "skautis/nette",
-	"type": "library",
-	"description": "Nette extension for Skautis library",
-	"keywords": ["skautis", "api", "nette"],
-	"homepage": "https://github.com/skaut/SkautisNette",
-	"license": ["BSD-3-Clause"],
-	"authors": [
-		{
-			"name": "František Hána",
-			"homepage": "http://sinacek.cz"
-		}
-	],
-	"support": {
-		"wiki": "http://is.skaut.cz/napoveda/",
-		"source": "https://github.com/skaut/SkautisNette"
-	},
-	"require": {
-		"php": ">=5.3.0",
-		"skautis/skautis": "~2.0@dev",
-		"nette/nette": "2.1.*"
-	},
-	"require-dev": {
-		"nette/tester": "~1.3"
-	},
-	"autoload": {
-		"psr-4": {
-			"Skautis\\Nette\\": "src/"
-		}
-	},
-	"minimum-stability": "stable",
-	"prefer-stable": true
-}
diff --git a/tests/composer-nette-2.2.json b/tests/composer-nette-2.2.json
deleted file mode 100644
index 82c32ee..0000000
--- a/tests/composer-nette-2.2.json
+++ /dev/null
@@ -1,37 +0,0 @@
-{
-	"name": "skautis/nette",
-	"type": "library",
-	"description": "Nette extension for Skautis library",
-	"keywords": ["skautis", "api", "nette"],
-	"homepage": "https://github.com/skaut/SkautisNette",
-	"license": ["BSD-3-Clause"],
-	"authors": [
-		{
-			"name": "František Hána",
-			"homepage": "http://sinacek.cz"
-		}
-	],
-	"support": {
-		"wiki": "http://is.skaut.cz/napoveda/",
-		"source": "https://github.com/skaut/SkautisNette"
-	},
-	"require": {
-		"php": ">=5.3.0",
-		"skautis/skautis": "~2.0@dev",
-		"nette/di": "2.2.*",
-		"nette/http": "2.2.*"
-	},
-	"require-dev": {
-		"nette/tester": "~1.3",
-		"nette/nette": "2.2.*",
-		"nette/bootstrap": "2.2.*",
-		"tracy/tracy": "2.2.*"
-	},
-	"autoload": {
-		"psr-4": {
-			"Skautis\\Nette\\": "src/"
-		}
-	},
-	"minimum-stability": "stable",
-	"prefer-stable": true
-}
diff --git a/tests/composer-nette-2.3.json b/tests/composer-nette-2.3.json
deleted file mode 100644
index 1c9e181..0000000
--- a/tests/composer-nette-2.3.json
+++ /dev/null
@@ -1,37 +0,0 @@
-{
-	"name": "skautis/nette",
-	"type": "library",
-	"description": "Nette extension for Skautis library",
-	"keywords": ["skautis", "api", "nette"],
-	"homepage": "https://github.com/skaut/SkautisNette",
-	"license": ["BSD-3-Clause"],
-	"authors": [
-		{
-			"name": "František Hána",
-			"homepage": "http://sinacek.cz"
-		}
-	],
-	"support": {
-		"wiki": "http://is.skaut.cz/napoveda/",
-		"source": "https://github.com/skaut/SkautisNette"
-	},
-	"require": {
-		"php": ">=5.3.0",
-		"skautis/skautis": "~2.0@dev",
-		"nette/di": "2.3.*",
-		"nette/http": "2.3.*"
-	},
-	"require-dev": {
-		"nette/tester": "~1.3",
-		"nette/nette": "2.3.*",
-		"nette/bootstrap": "2.3.*",
-		"tracy/tracy": "2.3.*"
-	},
-	"autoload": {
-		"psr-4": {
-			"Skautis\\Nette\\": "src/"
-		}
-	},
-	"minimum-stability": "stable",
-	"prefer-stable": true
-}
diff --git a/tests/composer-nette-2.4.json b/tests/composer-nette-2.4.json
index 32ffd4f..e1c52e4 100644
--- a/tests/composer-nette-2.4.json
+++ b/tests/composer-nette-2.4.json
@@ -16,8 +16,9 @@
 		"source": "https://github.com/skaut/SkautisNette"
 	},
 	"require": {
-		"php": ">=5.3.0",
+		"php": ">=5.6",
 		"skautis/skautis": "~2.0@dev",
+		"nette/utils": "2.4.*",
 		"nette/di": "2.4.*",
 		"nette/http": "2.4.*"
 	},