diff --git a/app/views/content_items/_attachments.html.erb b/app/views/content_items/_attachments.html.erb
index 61b1f1cce..851bfff45 100644
--- a/app/views/content_items/_attachments.html.erb
+++ b/app/views/content_items/_attachments.html.erb
@@ -10,14 +10,16 @@
       } do %>
         <%= sanitize(legacy_pre_rendered_documents, {
           attributes: %w(alt class href id src data-module data-track-category data-track-action data-track-label data-track-options data-details-track-click),
-          tags: %w(a details div h2 img p section span summary),
+          tags: %w(a details div h2 h3 img p section span summary),
         }) %>
       <% end %>
     <% else %>
       <% attachments.each do |attachment_id| %>
         <div class="attachment">
-          <%= render 'govuk_publishing_components/components/attachment',
-              attachment: @content_item.attachment_details(attachment_id) %>
+          <%= render 'govuk_publishing_components/components/attachment', {
+            heading_level: 3,
+            attachment: @content_item.attachment_details(attachment_id)
+          } %>
         </div>
       <% end %>
     <% end %>