diff --git a/src/_h5ai/conf/options.json b/src/_h5ai/conf/options.json
index 4ae24bb0..59a1cf90 100644
--- a/src/_h5ai/conf/options.json
+++ b/src/_h5ai/conf/options.json
@@ -52,7 +52,7 @@ Options
         "hideParentFolder": false,
         "modes": ["details", "grid", "icons"],
         "setParentFolderLabels": true,
-        "sizes": [24, 32, 48, 64, 96],
+        "sizes": [24, 32, 48, 64, 96, 128],
         "smartBrowsing": true,
         "theme": "",
         "unmanaged": ["index.html", "index.htm", "index.php"],
@@ -331,7 +331,7 @@ Options
         "mov": ["vid-avi", "vid-flv", "vid-mkv", "vid-mov", "vid-mp4", "vid-mpg", "vid-webm"],
         "doc": ["x-pdf", "x-ps"],
         "delay": 1,
-        "size": 96,
+        "size": 128,
         "exif": true
     },