diff --git a/Parser/MarkdownParser.php b/Parser/MarkdownParser.php
index 9999cec..378786a 100644
--- a/Parser/MarkdownParser.php
+++ b/Parser/MarkdownParser.php
@@ -19,7 +19,7 @@ class MarkdownParser extends MarkdownExtra implements MarkdownParserInterface
      *
      * @var array Enabled features
      */
-    protected array $features = array(
+    protected $features = array(
         'header' => true,
         'list' => true,
         'horizontal_rule' => true,
diff --git a/Parser/Preset/Light.php b/Parser/Preset/Light.php
index ca12e7c..aac1b95 100644
--- a/Parser/Preset/Light.php
+++ b/Parser/Preset/Light.php
@@ -12,7 +12,7 @@ class Light extends MarkdownParser
     /**
      * @var array Enabled features
      */
-    protected array $features = array(
+    protected $features = array(
         'header' => true,
         'list' => true,
         'horizontal_rule' => true,
diff --git a/Parser/Preset/Medium.php b/Parser/Preset/Medium.php
index 70ddd89..3de4d1e 100644
--- a/Parser/Preset/Medium.php
+++ b/Parser/Preset/Medium.php
@@ -12,7 +12,7 @@ class Medium extends MarkdownParser
     /**
      * @var array Enabled features
      */
-    protected array $features = array(
+    protected $features = array(
         'header' => true,
         'list' => true,
         'horizontal_rule' => true,