diff --git a/lib/ast/utils/format.ts b/lib/ast/utils/format.ts
index 82f39a5..2b6cb72 100644
--- a/lib/ast/utils/format.ts
+++ b/lib/ast/utils/format.ts
@@ -159,7 +159,7 @@ export function isAllowedLowercase(value: string) {
 
 	if (VERSION_REGEX.test(value)) return true;
 
-	return ["bmp", "tiff", "gif", "jpg", "jpeg", "png"].includes(value);
+	return ["bmp", "tiff", "gif", "jpg", "jpeg", "png", "webp"].includes(value);
 }
 
 function isUrl(str: string) {