diff --git a/src/Math/Reader/MathML.php b/src/Math/Reader/MathML.php
index 4d50a28..653a452 100644
--- a/src/Math/Reader/MathML.php
+++ b/src/Math/Reader/MathML.php
@@ -19,7 +19,7 @@ class MathML implements ReaderInterface
     /** @var DOMDocument */
     private $dom;
 
-    /** @var DOMXpath */
+    /** @var DOMXPath */
     private $xpath;
 
     public function read(string $content): ?Math
@@ -48,7 +48,7 @@ public function read(string $content): ?Math
      */
     protected function parseNode(?DOMNode $nodeRowElement, $parent): void
     {
-        $this->xpath = new DOMXpath($this->dom);
+        $this->xpath = new DOMXPath($this->dom);
         foreach ($this->xpath->query('*', $nodeRowElement) ?: [] as $nodeElement) {
             if ($parent instanceof Element\Semantics
                 && $nodeElement instanceof DOMElement
diff --git a/src/Math/Reader/OfficeMathML.php b/src/Math/Reader/OfficeMathML.php
index c856023..9cc3f73 100644
--- a/src/Math/Reader/OfficeMathML.php
+++ b/src/Math/Reader/OfficeMathML.php
@@ -18,7 +18,7 @@ class OfficeMathML implements ReaderInterface
     /** @var Math */
     protected $math;
 
-    /** @var DOMXpath */
+    /** @var DOMXPath */
     protected $xpath;
 
     /** @var string[] */
@@ -52,7 +52,7 @@ public function read(string $content): ?Math
      */
     protected function parseNode(?DOMNode $nodeRowElement, $parent): void
     {
-        $this->xpath = new DOMXpath($this->dom);
+        $this->xpath = new DOMXPath($this->dom);
         foreach ($this->xpath->query('*', $nodeRowElement) ?: [] as $nodeElement) {
             $element = $this->getElement($nodeElement);
             $parent->add($element);
diff --git a/tests/Math/Writer/MathMLTest.php b/tests/Math/Writer/MathMLTest.php
index fe22f48..06aac38 100644
--- a/tests/Math/Writer/MathMLTest.php
+++ b/tests/Math/Writer/MathMLTest.php
@@ -95,7 +95,7 @@ public function testWriteNotImplemented(): void
 
         $math = new Math();
 
-        $object = new class() extends Element\AbstractElement {};
+        $object = new class extends Element\AbstractElement {};
         $math->add($object);
 
         $writer = new MathML();
diff --git a/tests/Math/Writer/OfficeMathMLTest.php b/tests/Math/Writer/OfficeMathMLTest.php
index 385e868..40060f0 100644
--- a/tests/Math/Writer/OfficeMathMLTest.php
+++ b/tests/Math/Writer/OfficeMathMLTest.php
@@ -70,7 +70,7 @@ public function testWriteNotImplemented(): void
 
         $math = new Math();
 
-        $object = new class() extends Element\AbstractElement {};
+        $object = new class extends Element\AbstractElement {};
         $math->add($object);
 
         $writer = new OfficeMathML();