diff --git a/apps/api/app/services/rss_service.rb b/apps/api/app/services/rss_service.rb
index 88500db..b6f019d 100644
--- a/apps/api/app/services/rss_service.rb
+++ b/apps/api/app/services/rss_service.rb
@@ -43,7 +43,7 @@ class RssService
           item.title       = "#{sw.title} v#{release.version}"
           item.link        = "#{SITE_URL}/catalog/#{sw.name}"
           item.description = "#{sw.title} #{release.version} released – #{sw.desc}"
-          item.pubDate     = release.created_at
+          item.pubDate     = release.created_at.to_time
         end
       end
     end.to_s