diff --git a/.php_cs b/.php_cs
index 12229a2..42fded2 100644
--- a/.php_cs
+++ b/.php_cs
@@ -1,13 +1,14 @@
 <?php
 
-$finder = Symfony\CS\Finder\DefaultFinder::create()
+$finder = PhpCsFixer\Finder::create()
     ->in([
-        __DIR__ . DIRECTORY_SEPARATOR . 'benchmarks',
-        __DIR__ . DIRECTORY_SEPARATOR . 'src',
-        __DIR__ . DIRECTORY_SEPARATOR . 'tests',
+        __DIR__ . '/src',
+        __DIR__ . '/tests',
     ]);
 
-return Symfony\CS\Config\Config::create()
-    ->level(\Symfony\CS\FixerInterface::PSR2_LEVEL)
-    ->fixers(['short_array_syntax'])
-    ->finder($finder);
\ No newline at end of file
+return PhpCsFixer\Config::create()
+    ->setRules([
+        '@PSR2' => true,
+        'array_syntax' => ['syntax' => 'short'],
+    ])
+    ->setFinder($finder);
diff --git a/src/Factory/WzClassificationFactory.php b/src/Factory/WzClassificationFactory.php
index fad9e18..20464a4 100644
--- a/src/Factory/WzClassificationFactory.php
+++ b/src/Factory/WzClassificationFactory.php
@@ -43,7 +43,8 @@ public static function buildFromFile($xmlFile)
 
         if (!$xml) {
             throw new InvalidArgumentException(
-                sprintf("Invalid XML file `%s`.", $xmlFile));
+                sprintf("Invalid XML file `%s`.", $xmlFile)
+            );
         }
 
         return self::buildFromXml($xml);
@@ -87,7 +88,8 @@ private static function buildItems(SimpleXMLElement $xml)
                 $itemId,
                 self::buildLabels($xmlItem),
                 $itemLevel,
-                $parent);
+                $parent
+            );
 
             $items[] = $current;
             $levels[$itemLevel] = $current;
diff --git a/src/WzClassification.php b/src/WzClassification.php
index b69db04..e57118f 100644
--- a/src/WzClassification.php
+++ b/src/WzClassification.php
@@ -28,7 +28,8 @@ public function __construct(array $items)
             if (!$item instanceof WzItemInterface) {
                 throw new InvalidArgumentException(sprintf(
                     'Only `%s` objects are allowed.',
-                    WzItemInterface::class));
+                    WzItemInterface::class
+                ));
             }
 
             $this->items[$item->getId()] = $item;
@@ -62,7 +63,9 @@ public function getItemsByLevel($level)
                 $this->items,
                 function (WzItemInterface $item) use ($level) {
                     return $item->getLevel() == $level;
-                }));
+                }
+            )
+        );
     }
 
     /**
diff --git a/src/WzItem.php b/src/WzItem.php
index 27b0b0c..6ef07e0 100644
--- a/src/WzItem.php
+++ b/src/WzItem.php
@@ -81,7 +81,8 @@ public function getLabel($langCode)
         throw new InvalidArgumentException(sprintf(
             'Unsupported language code `%s`. Supported codes: `%s`.',
             $langCode,
-            implode(',', array_keys($this->labels))));
+            implode(',', array_keys($this->labels))
+        ));
     }
 
     /**
@@ -140,7 +141,8 @@ public function addChild(WzItemInterface $child)
                 "The parent of `%s` is invalid. Expected `%s` but got `%s`.",
                 $child->getId(),
                 $this->getId(),
-                $child->getParent() ? $child->getParent()->getId() : ''));
+                $child->getParent() ? $child->getParent()->getId() : ''
+            ));
         }
 
         $this->children[] = $child;
diff --git a/tests/Factory/WzClassificationFactoryTest.php b/tests/Factory/WzClassificationFactoryTest.php
index 68eb479..b084670 100644
--- a/tests/Factory/WzClassificationFactoryTest.php
+++ b/tests/Factory/WzClassificationFactoryTest.php
@@ -43,7 +43,8 @@ public function testDefaultClassification()
     {
         $this->assertInstanceOf(
             WzClassificationInterface::class,
-            WzClassificationFactory::build());
+            WzClassificationFactory::build()
+        );
     }
 
     public function testDefaultClassification_Count()
@@ -92,7 +93,8 @@ public function testDefaultClassification_Children()
 
         $this->assertSame(
             $item->getChildren(),
-            $item->getChildrenByLevel($item::LEVEL_SUBCLASS));
+            $item->getChildrenByLevel($item::LEVEL_SUBCLASS)
+        );
 
         $this->assertSame('74.10.1', $item->getChildren()[0]->getId());
         $this->assertSame('74.10.2', $item->getChildren()[1]->getId());
@@ -125,7 +127,8 @@ public function testDefaultClassification_Parents()
         $this->assertSame(4, $parent->getLevel());
         $this->assertSame(
             'Ateliers für Textil-, Schmuck-, Grafik- u. ä. Design',
-            $parent->getLabel('de'));
+            $parent->getLabel('de')
+        );
 
         $parent = $item->getParentByLevel(WzItemInterface::LEVEL_GROUP);
 
@@ -133,7 +136,8 @@ public function testDefaultClassification_Parents()
         $this->assertSame(3, $parent->getLevel());
         $this->assertSame(
             'Ateliers für Textil-, Schmuck-, Grafik- u. ä. Design',
-            $parent->getLabel('de'));
+            $parent->getLabel('de')
+        );
 
         $parent = $item->getParentByLevel(WzItemInterface::LEVEL_DIVISION);
 
@@ -141,7 +145,8 @@ public function testDefaultClassification_Parents()
         $this->assertSame(2, $parent->getLevel());
         $this->assertSame(
             'Sonstige freiberufliche, wissenschaftliche und technische Tätigkeiten',
-            $parent->getLabel('de'));
+            $parent->getLabel('de')
+        );
 
         $parent = $item->getParentByLevel(WzItemInterface::LEVEL_SECTION);
 
@@ -149,6 +154,7 @@ public function testDefaultClassification_Parents()
         $this->assertSame(1, $parent->getLevel());
         $this->assertSame(
             'Erbringung von freiberuflichen, wissenschaftlichen und technischen Dienstleistungen',
-            $parent->getLabel('de'));
+            $parent->getLabel('de')
+        );
     }
 }
diff --git a/tests/WzClassificationTest.php b/tests/WzClassificationTest.php
index 59d3ce1..1709936 100644
--- a/tests/WzClassificationTest.php
+++ b/tests/WzClassificationTest.php
@@ -68,7 +68,8 @@ public function testInvalidInput()
         } catch (InvalidArgumentException $e) {
             $this->assertSame(
                 sprintf('Only `%s` objects are allowed.', WzItemInterface::class),
-                $e->getMessage());
+                $e->getMessage()
+            );
         }
     }
 }
diff --git a/tests/WzItemTest.php b/tests/WzItemTest.php
index c0b46bf..6a4be12 100644
--- a/tests/WzItemTest.php
+++ b/tests/WzItemTest.php
@@ -109,20 +109,23 @@ public function testParentFunctions(array $map)
         $this->assertSame(
             $map['01.11'],
             $map['01.11.0']
-                ->getParent());
+                ->getParent()
+        );
 
         $this->assertSame(
             $map['01.1'],
             $map['01.11.0']
                 ->getParent()
-                ->getParent());
+                ->getParent()
+        );
 
         $this->assertSame(
             $map['01'],
             $map['01.11.0']
                 ->getParent()
                 ->getParent()
-                ->getParent());
+                ->getParent()
+        );
 
         $this->assertSame(
             $map['A'],
@@ -130,7 +133,8 @@ public function testParentFunctions(array $map)
                 ->getParent()
                 ->getParent()
                 ->getParent()
-                ->getParent());
+                ->getParent()
+        );
     }
 
     /**
@@ -153,27 +157,31 @@ public function testChildrenFunctions(array $map)
             [
                 $map['01'],
             ],
-            $map['A']->getChildrenByLevel(2));
+            $map['A']->getChildrenByLevel(2)
+        );
 
         $this->assertSame(
             [
                 $map['01.1'],
             ],
-            $map['A']->getChildrenByLevel(3));
+            $map['A']->getChildrenByLevel(3)
+        );
 
         $this->assertSame(
             [
                 $map['01.11'],
                 $map['01.12'],
             ],
-            $map['A']->getChildrenByLevel(4));
+            $map['A']->getChildrenByLevel(4)
+        );
 
         $this->assertSame(
             [
                 $map['01.11.0'],
                 $map['01.12.0'],
             ],
-            $map['A']->getChildrenByLevel(5));
+            $map['A']->getChildrenByLevel(5)
+        );
     }
 
     public function testChildrenOutOfBounds()
@@ -263,7 +271,8 @@ public function testLabel()
         } catch (InvalidArgumentException $e) {
             $this->assertSame(
                 'Unsupported language code `fr`. Supported codes: `de,en`.',
-                $e->getMessage());
+                $e->getMessage()
+            );
         }
     }
 
@@ -300,7 +309,8 @@ public function testAddChild()
         } catch (InvalidParentException $e) {
             $this->assertSame(
                 'The parent of `P` is invalid. Expected `P` but got ``.',
-                $e->getMessage());
+                $e->getMessage()
+            );
         }
 
         try {
@@ -309,7 +319,8 @@ public function testAddChild()
         } catch (InvalidParentException $e) {
             $this->assertSame(
                 'The parent of `B` is invalid. Expected `A` but got `P`.',
-                $e->getMessage());
+                $e->getMessage()
+            );
         }
     }
 }