diff --git a/models/site.rb b/models/site.rb
index a0cc7290..74977ff1 100644
--- a/models/site.rb
+++ b/models/site.rb
@@ -13,6 +13,7 @@ class Site < Sequel::Model
     text/css
     application/javascript
     image/png
+    image/apng
     image/jpeg
     image/gif
     image/svg
@@ -44,7 +45,7 @@ class Site < Sequel::Model
   }
 
   VALID_EXTENSIONS = %w{
-    html htm txt text css js jpg jpeg png gif svg md markdown eot ttf woff woff2 json geojson csv tsv mf ico pdf asc key pgp xml mid midi manifest otf webapp less sass rss kml dae obj mtl scss webp avif xcf epub gltf bin webmanifest knowl atom opml rdf map gpg resolveHandle
+    html htm txt text css js jpg jpeg png apng gif svg md markdown eot ttf woff woff2 json geojson csv tsv mf ico pdf asc key pgp xml mid midi manifest otf webapp less sass rss kml dae obj mtl scss webp avif xcf epub gltf bin webmanifest knowl atom opml rdf map gpg resolveHandle
   }
 
   VALID_EDITABLE_EXTENSIONS = %w{