diff --git a/atom.xml b/atom.xml
index 5d824e6..2ee1274 100644
--- a/atom.xml
+++ b/atom.xml
@@ -9,11 +9,9 @@ layout: none
     <link>{{ site.url }}</link>
 
     <!-- Combine blog posts and updates -->
-    {% assign updates_posts = site.collections.updates.docs %}
-    {% if updates_posts == nil %}
-      {% assign updates_posts = [] %}
-    {% endif %}
-    {% assign all_posts = site.posts | concat: updates_posts %}
+    {% assign updates_posts = site.collections['updates'].docs | default: [] %}
+    
+    {% assign all_posts = site.posts | merge: updates_posts %}
     {% assign sorted_posts = all_posts | sort: 'date' %}
 
     {% for post in sorted_posts %}
@@ -29,5 +27,4 @@ layout: none
       {% endunless %}
     {% endfor %}
   </channel>
-</rss>
-</rss>
+</rss>
\ No newline at end of file