diff --git a/config/_default/markup.toml b/config/_default/markup.toml
index e388f49..834dcc7 100644
--- a/config/_default/markup.toml
+++ b/config/_default/markup.toml
@@ -20,7 +20,7 @@ reproducible = true
 stem = "latexmath"
 
 avatarsdir = "/icons/avatars"
-avatarstype = "avif"
+avatarstype = "webp"
 
 icons = "image"
 iconsdir = "/icons/asciidoctor"