diff --git a/README.md b/README.md
index 304d3ff..176f3de 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 <img width="500" src="./docs/img/tods_logo.png" alt="Logo" />
 
 [![Actions Status](https://github.com/datamllab/tods/workflows/Build/badge.svg)](https://github.com/datamllab/tods/actions)
-[![codecov](https://codecov.io/gh/datamllab/tods/branch/dev/graph/badge.svg?token=M90ZCVTRBF)](https://codecov.io/gh/datamllab/tods)
+[![codecov](https://codecov.io/gh/datamllab/tods/branch/master/graph/badge.svg?token=M90ZCVTRBF)](https://codecov.io/gh/datamllab/tods)
 
 [中文文档](README.zh-CN.md)