diff --git a/src/Highlighter.php b/src/Highlighter.php
index e59e3bb..b3ff9eb 100644
--- a/src/Highlighter.php
+++ b/src/Highlighter.php
@@ -49,14 +49,12 @@ public function __construct(
             ->addLanguage(new GdscriptLanguage())
             ->addLanguage(new HtmlLanguage())
             ->addLanguage(new JavaScriptLanguage())
-            ->addLanguage(new JavaScriptLanguage())
             ->addLanguage(new JsonLanguage())
             ->addLanguage(new PhpLanguage())
             ->addLanguage(new PythonLanguage())
             ->addLanguage(new SqlLanguage())
             ->addLanguage(new XmlLanguage())
             ->addLanguage(new YamlLanguage())
-            ->addLanguage(new YamlLanguage())
             ->addLanguage(new TwigLanguage());
     }