diff --git a/_layouts/default.html b/_layouts/default.html
index 3aec209..e7ccf9f 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -24,7 +24,7 @@
     si no existe.
     {% endcomment %}
     <link rel="preload" as="script" type="text/javascript" href="env.js" />
-    <script type="text/javascript" src="env.js"></script>
+    <script type="text/javascript" src="env.js?{{ site.time | date: '%s' }}"></script>
     {% include_cached pack.html %}
 
     {% comment %}