diff --git a/src/script.php b/src/script.php
index e11ec38..83947fe 100644
--- a/src/script.php
+++ b/src/script.php
@@ -91,11 +91,25 @@ class Tpl_MokoonyxInstallerScript implements InstallerScriptInterface
         // On install or update: migrate from MokoCassiopeia if it exists
         if ($type === 'install' || $type === 'update') {
             $this->migrateFromCassiopeia();
+            $this->clearFaviconStamp();
         }
 
         return true;
     }
 
+    /**
+     * Delete the favicon stamp file so favicons and site.webmanifest
+     * are regenerated on the next page load after install/update.
+     */
+    private function clearFaviconStamp(): void
+    {
+        $stampFile = JPATH_ROOT . '/images/favicons/.favicon_generated';
+        if (is_file($stampFile)) {
+            @unlink($stampFile);
+            $this->logMessage('Cleared favicon stamp — will regenerate on next page load.');
+        }
+    }
+
     /**
      * Detect MokoCassiopeia and create matching MokoOnyx styles with the same params.
      * Creates a MokoOnyx style copy for each MokoCassiopeia style.