diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 605a6929bfd5ea3f22a0b216da30d3c05c7f21f0..ff463f690ff0aff49461e5459cd5c36dee45e886 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -11,7 +11,7 @@
     <ini name="error_reporting" value="-1"/>
     <server name="APP_ENV" value="test" force="true"/>
     <server name="SHELL_VERBOSITY" value="-1"/>
-    <server name="SYMFONY_DEPRECATIONS_HELPER" value="weak"/>
+    <server name="SYMFONY_DEPRECATIONS_HELPER" value='max[direct]=0&amp;quiet[]=indirect'/>
     <server name="KERNEL_CLASS" value="Dbp\Relay\TemplateBundle\Tests\Kernel"/>
   </php>
   <testsuites>
diff --git a/src/Command/TestCommand.php b/src/Command/TestCommand.php
index aae2a4c19920275b03917ffafe7122f2052511b2..87f017269ea95db95f5b772542404a7bbe10d4be 100644
--- a/src/Command/TestCommand.php
+++ b/src/Command/TestCommand.php
@@ -24,7 +24,7 @@ class TestCommand extends Command
         $this->setDescription('Hey there!');
     }
 
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $argument = $input->getArgument('argument');
         $output->writeln($argument);
diff --git a/src/DataPersister/PlaceDataPersister.php b/src/DataPersister/PlaceDataPersister.php
index d6ff8bce13023b1524101c97404d517d5b9f46f8..bec4060bdeaf343cbac30d2d9d05f5110212f573 100644
--- a/src/DataPersister/PlaceDataPersister.php
+++ b/src/DataPersister/PlaceDataPersister.php
@@ -23,7 +23,7 @@ class PlaceDataPersister extends AbstractController implements DataPersisterInte
         return $data instanceof Place;
     }
 
-    public function persist($data)
+    public function persist($data): void
     {
         // TODO
     }
diff --git a/src/DependencyInjection/Configuration.php b/src/DependencyInjection/Configuration.php
index 5506ae25e47a309b48ae4c6eec41cb820be535c9..4e38e5aead809d980374a54d4fc7aa5fbb187fac 100644
--- a/src/DependencyInjection/Configuration.php
+++ b/src/DependencyInjection/Configuration.php
@@ -9,7 +9,7 @@ use Symfony\Component\Config\Definition\ConfigurationInterface;
 
 class Configuration implements ConfigurationInterface
 {
-    public function getConfigTreeBuilder()
+    public function getConfigTreeBuilder(): TreeBuilder
     {
         $treeBuilder = new TreeBuilder('dbp_relay_template');