<% if google_maps_qs.present? %>
  <script type='text/javascript' src="//maps.google.com/maps/api/js?<%= google_maps_qs %>&v=3.26"></script>
<% end %>

<% if google_maps_qs.present? %>
  <script type='text/javascript' src="//maps.google.com/maps/api/js?<%= google_maps_qs %>&v=3.27"></script>
<% end %>

Use Google Maps Javascript API v3.27 (stable)
Use Google Maps Javascript API v3.27 (stable)
