diff --git a/README.md b/README.md
index 534e05834378be3a6181c003e5018e96be88b830..9084c251355f93a1b80fe5a9fcde6ba8a3bba429 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 <!-- Landscape | [![Code Health](https://landscape.io/github/ucoin-io/cutecoin/dev/landscape.svg?style=flat)](https://landscape.io/github/ucoin-io/cutecoin/dev) -->
 
-Coveralls | [![Coverage Status](https://coveralls.io/repos/ucoin-io/cutecoin/badge.svg)](https://coveralls.io/r/ucoin-io/cutecoin)
+Coveralls | [![Coverage Status](https://coveralls.io/repos/ucoin-io/cutecoin/badge.svg?branch=dev)](https://coveralls.io/r/ucoin-io/cutecoin)
 
 Travis | [![Build Status](https://travis-ci.org/ucoin-io/cutecoin.svg?branch=travis)](https://travis-ci.org/ucoin-io/cutecoin)