diff --git a/app/models/metadata_content.rb b/app/models/metadata_content.rb
index 1664a18f..761518e8 100644
--- a/app/models/metadata_content.rb
+++ b/app/models/metadata_content.rb
@@ -24,7 +24,7 @@ class MetadataContent < MetadataTemplate
   end
 
   def to_s
-    Nokogiri::HTML.fragment(value).tap do |html|
+    Nokogiri::HTML5.fragment(value).tap do |html|
       html.css('[src^="public/"]').each do |element|
         element['src'] = convert_internal_path_to_src element['src']
       end
@@ -46,7 +46,7 @@ class MetadataContent < MetadataTemplate
   # TODO: En lugar de comprobar el Content Type acá, restringir los
   # tipos de archivo a aceptar en ActiveStorage.
   def sanitize(html_string)
-    html = Nokogiri::HTML.fragment(super html_string)
+    html = Nokogiri::HTML5.fragment(super html_string)
     elements = 'img,audio,video,iframe'
 
     # Eliminar elementos sin src y comprobar su origen