diff --git a/README.md b/README.md
index 1aba7639f2..13c7f1137c 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 ![LICENSE](https://img.shields.io/badge/license-Apache--2.0-brightgreen.svg)
 ![Language](https://img.shields.io/badge/language-C%2B%2B-blue.svg)
 ![Release](https://img.shields.io/badge/Release-v0.5.0-orange.svg)
-![Release date](https://img.shields.io/badge/release date-October-yellowgreen.svg)
+![Release date](https://img.shields.io/badge/release__date-October-yellowgreen)
 
 # Milvus is coming soon!