diff --git a/src/_includes/layouts/base.njk b/src/_includes/layouts/base.njk
index c264047..7d2647d 100644
--- a/src/_includes/layouts/base.njk
+++ b/src/_includes/layouts/base.njk
@@ -58,7 +58,7 @@
 
     <link rel="alternate" type="application/rss+xml" title="{{ meta.title }} Blog" href="/blog/feed.xml" />
 
-    {% if data.env === "production" %}<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f); })(window,document,'script','dataLayer','GTM-K5WB4B6');</script>{% endif %}
+    {% if data.env === "production" %}<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.defer=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f); })(window,document,'script','dataLayer','GTM-K5WB4B6');</script>{% endif %}
 
   </head>