diff --git a/src/Command/CacheLatestArticlesCommand.php b/src/Command/CacheLatestArticlesCommand.php
index 42617e0..3ae10f6 100644
--- a/src/Command/CacheLatestArticlesCommand.php
+++ b/src/Command/CacheLatestArticlesCommand.php
@@ -60,6 +60,10 @@ class CacheLatestArticlesCommand extends Command
             $collapse->setFieldname('slug');
             $query->setCollapse($collapse);
 
+            $collapse2 = new Collapse();
+            $collapse2->setFieldname('pubkey');
+            $query->setCollapse($collapse2);
+
             $articles = $this->finder->find($query);
 
             $cacheItem->set($articles);
diff --git a/src/Controller/DefaultController.php b/src/Controller/DefaultController.php
index 18689f7..305a018 100644
--- a/src/Controller/DefaultController.php
+++ b/src/Controller/DefaultController.php
@@ -88,6 +88,11 @@ class DefaultController extends AbstractController
             $collapse->setFieldname('slug');
             $query->setCollapse($collapse);
 
+            // Use collapse to deduplicate by author
+            $collapse2 = new Collapse();
+            $collapse2->setFieldname('pubkey');
+            $query->setCollapse($collapse2);
+
             $articles = $finder->find($query);
 
             $cacheItem->set($articles);