diff --git a/.dockerignore b/.dockerignore
index 491fc35..996cb5c 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,2 +1,9 @@
 node_modules
 lib
+Dockerfile
+Dockerfile.arm32v7
+Dockerfile.arm64v8
+README.md
+.all-contributorsrc
+env.example
+.github/
diff --git a/src/library/types.cr b/src/library/types.cr
index a4de007..0545184 100644
--- a/src/library/types.cr
+++ b/src/library/types.cr
@@ -1,4 +1,12 @@
-SUPPORTED_IMG_TYPES = ["image/jpeg", "image/png", "image/webp"]
+SUPPORTED_IMG_TYPES = %w(
+  image/jpeg
+  image/png
+  image/webp
+  image/apng
+  image/avif
+  image/gif
+  image/svg+xml
+)
 
 enum SortMethod
   Auto
diff --git a/src/util/util.cr b/src/util/util.cr
index 833f1ca..9f5ffee 100644
--- a/src/util/util.cr
+++ b/src/util/util.cr
@@ -35,6 +35,11 @@ def register_mime_types
     # FontAwesome fonts
     ".woff"  => "font/woff",
     ".woff2" => "font/woff2",
+
+    # Supported image formats. JPG, PNG, GIF, WebP, and SVG are already
+    #   defiend by Crystal in `MIME.DEFAULT_TYPES`
+    ".apng" => "image/apng",
+    ".avif" => "image/avif",
   }.each do |k, v|
     MIME.register k, v
   end