diff --git a/src/server/api/index.ts b/src/server/api/index.ts
index 23203d914..c39911c35 100644
--- a/src/server/api/index.ts
+++ b/src/server/api/index.ts
@@ -14,7 +14,11 @@ const handler = require('./api-handler').default;
 
 // Init app
 const app = new Koa();
-app.use(cors());
+
+app.use(cors({
+	origin: '*'
+}));
+
 app.use(bodyParser({
 	// リクエストが multipart/form-data でない限りはJSONだと見なす
 	detectJSON: ctx => !ctx.is('multipart/form-data')