diff --git a/DataCollector/WorkflowDataCollector.php b/DataCollector/WorkflowDataCollector.php
index 0cb7e20..6ce732b 100644
--- a/DataCollector/WorkflowDataCollector.php
+++ b/DataCollector/WorkflowDataCollector.php
@@ -101,7 +101,7 @@ public function buildMermaidLiveLink(string $name): string
             'autoSync' => false,
         ];
 
-        $compressed = zlib_encode(json_encode($payload), ZLIB_ENCODING_DEFLATE);
+        $compressed = zlib_encode(json_encode($payload), \ZLIB_ENCODING_DEFLATE);
 
         $suffix = rtrim(strtr(base64_encode($compressed), '+/', '-_'), '=');
 
diff --git a/DependencyInjection/WorkflowValidatorPass.php b/DependencyInjection/WorkflowValidatorPass.php
index 60072ef..d1e4622 100644
--- a/DependencyInjection/WorkflowValidatorPass.php
+++ b/DependencyInjection/WorkflowValidatorPass.php
@@ -14,7 +14,6 @@
 use Symfony\Component\Config\Resource\FileResource;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\DependencyInjection\Exception\LogicException;
 
 /**
  * @author Grégoire Pineau <lyrixx@lyrixx.info>
diff --git a/Dumper/GraphvizDumper.php b/Dumper/GraphvizDumper.php
index 2aaf549..ad7b0c2 100644
--- a/Dumper/GraphvizDumper.php
+++ b/Dumper/GraphvizDumper.php
@@ -141,7 +141,7 @@ protected function findTransitions(Definition $definition, bool $withMetadata):
     /**
      * @internal
      */
-    protected function addPlaces(array $places, float $withMetadata): string
+    protected function addPlaces(array $places, bool $withMetadata): string
     {
         $code = '';
 
@@ -303,7 +303,7 @@ protected function addAttributes(array $attributes): string
      *
      * @internal
      */
-    protected function formatLabel(Definition $definition, string $withMetadata, array $options): string
+    protected function formatLabel(Definition $definition, bool $withMetadata, array $options): string
     {
         $currentLabel = $options['label'] ?? '';
 
diff --git a/Tests/Dumper/MermaidDumperTest.php b/Tests/Dumper/MermaidDumperTest.php
index 3a29da6..a8d1978 100644
--- a/Tests/Dumper/MermaidDumperTest.php
+++ b/Tests/Dumper/MermaidDumperTest.php
@@ -104,7 +104,7 @@ public static function provideWorkflowDefinitionWithoutMarking(): iterable
             ."transition4-->place6\n"
             ."transition5[\"t6\"]\n"
             ."place5-->transition5\n"
-            ."transition5-->place6",
+            .'transition5-->place6',
         ];
         yield [
             self::createWorkflowWithSameNameTransition(),
@@ -124,7 +124,7 @@ public static function provideWorkflowDefinitionWithoutMarking(): iterable
             ."transition2-->place0\n"
             ."transition3[\"to_a\"]\n"
             ."place2-->transition3\n"
-            ."transition3-->place0",
+            .'transition3-->place0',
         ];
         yield [
             self::createSimpleWorkflowDefinition(),
@@ -140,7 +140,7 @@ public static function provideWorkflowDefinitionWithoutMarking(): iterable
             ."linkStyle 1 stroke:Grey\n"
             ."transition1[\"t2\"]\n"
             ."place1-->transition1\n"
-            ."transition1-->place2",
+            .'transition1-->place2',
         ];
     }
 
@@ -169,7 +169,7 @@ public static function provideWorkflowWithReservedWords(): iterable
             ."place1-->transition0\n"
             ."transition1[\"t1\"]\n"
             ."place2-->transition1\n"
-            ."transition1-->place3",
+            .'transition1-->place3',
         ];
     }
 
@@ -186,7 +186,7 @@ public static function provideStateMachine(): iterable
             ."place3-->|\"My custom transition label 3\"|place1\n"
             ."linkStyle 1 stroke:Grey\n"
             ."place1-->|\"t2\"|place2\n"
-            ."place1-->|\"t3\"|place3",
+            .'place1-->|"t3"|place3',
         ];
     }
 
@@ -212,7 +212,7 @@ public static function provideWorkflowWithMarking(): iterable
             ."linkStyle 1 stroke:Grey\n"
             ."transition1[\"t2\"]\n"
             ."place1-->transition1\n"
-            ."transition1-->place2",
+            .'transition1-->place2',
         ];
     }
 }

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