diff --git a/src/index.ts b/src/index.ts
index c7026aa..b8101c8 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -85,7 +85,8 @@ export function transfromSwagger(inputDoc: AllSwaggerDocumentVersions, options:
  */
 export async function transformFile(options: Options): Promise<string> {
   const swaggerParser = new SwaggerParser();
-  const $refs: SwaggerParser.$Refs = await swaggerParser.resolve(options.input);
+  const bundle = await swaggerParser.bundle(options.input);
+  const $refs: SwaggerParser.$Refs = await swaggerParser.resolve(bundle);
   const dereferencedDocument = partiallyDereference(swaggerParser.api, $refs);
   const markdown = transfromSwagger(dereferencedDocument, options);