diff --git a/config/config.exs b/config/config.exs
index 876d25c26..de36d40cd 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -169,7 +169,10 @@ config :mime, :types, %{
   "application/xrd+xml" => ["xrd+xml"],
   "application/jrd+json" => ["jrd+json"],
   "application/activity+json" => ["activity+json"],
-  "application/ld+json" => ["activity+json"]
+  "application/ld+json" => ["activity+json"],
+  # Can be removed when bumping MIME past 2.0.5
+  # see https://akkoma.dev/AkkomaGang/akkoma/issues/657
+  "image/apng" => ["apng"]
 }
 
 config :tesla, :adapter, {Tesla.Adapter.Finch, name: MyFinch}