diff --git a/src/routes/api_docs.ts b/src/routes/api_docs.ts
index f2fb9e08e..4f8e65b52 100644
--- a/src/routes/api_docs.ts
+++ b/src/routes/api_docs.ts
@@ -1,13 +1,13 @@
 import type { Router } from "express";
 import swaggerUi from "swagger-ui-express";
-import { readFileSync } from "fs";
+import { readFile } from "fs/promises";
 import { fileURLToPath } from "url";
 import { dirname, join } from "path";
 import yaml from "js-yaml";
 
 const __dirname = dirname(fileURLToPath(import.meta.url));
 const swaggerDocument = yaml.load(
-    readFileSync(join(__dirname, "../etapi/etapi.openapi.yaml"), "utf8")
+    await readFile(join(__dirname, "../etapi/etapi.openapi.yaml"), "utf8")
 ) as object;
 
 function register(router: Router) {