diff --git a/models/site.rb b/models/site.rb
index 4724a458..f45c2bea 100644
--- a/models/site.rb
+++ b/models/site.rb
@@ -35,6 +35,7 @@ class Site < Sequel::Model
     application/rss+xml
     application/x-elc
     image/webp
+    image/avif
     image/x-xcf
     application/epub
     application/epub+zip
@@ -43,7 +44,7 @@ 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 xcf epub gltf bin webmanifest knowl atom opml rdf map gpg resolveHandle
+    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
   }
 
   VALID_EDITABLE_EXTENSIONS = %w{