diff --git a/README.md b/README.md
index 74550c8..6cceccb 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 # bybit-api
-[![npm version](https://img.shields.io/npm/v/bybit-api/latest)][1] [![npm size](https://img.shields.io/bundlephobia/min/bybit-api/latest)][1] [![npm downloads](https://img.shields.io/npm/dt/bybit-api)][1]
+[![npm version](https://img.shields.io/npm/v/bybit-api)][1] [![npm size](https://img.shields.io/bundlephobia/min/bybit-api/latest)][1] [![npm downloads](https://img.shields.io/npm/dt/bybit-api)][1]
 [![last commit](https://img.shields.io/github/last-commit/tiagosiebler/bybit-api)][1]
 [![CodeFactor](https://www.codefactor.io/repository/github/tiagosiebler/bybit-api/badge)](https://www.codefactor.io/repository/github/tiagosiebler/bybit-api)
 
diff --git a/lib/util/requestUtils.js b/lib/util/requestUtils.js
index 5dafab5..1e7f348 100644
--- a/lib/util/requestUtils.js
+++ b/lib/util/requestUtils.js
@@ -6,7 +6,7 @@ module.exports = {
       .update(message)
       .digest('hex');
   },
-  serializeParams(params, strict_validation) {
+  serializeParams(params = {}, strict_validation = false) {
     return Object.keys(params)
       .sort()
       .map(key => {