diff --git a/README.md b/README.md
index 64770aa7e..aed570925 100644
--- a/README.md
+++ b/README.md
@@ -12,8 +12,9 @@
     <img src="https://img.shields.io/npm/v/vant.svg?style=flat" alt="npm version" />
     <img src="https://travis-ci.org/youzan/vant.svg?branch=master" alt="Build Status" />
     <img src="https://img.shields.io/npm/dt/vant.svg" alt="downloads" />
-    <img src="http://img.badgesize.io/https://unpkg.com/vant/lib/vant.min.js?compression=gzip&style=flat-square&label=JS%20gzip%20size" alt="JS Gzip Size" />
-    <img src="http://img.badgesize.io/https://unpkg.com/vant/lib/vant-css/index.css?compression=gzip&style=flat-square&label=CSS%20gzip%20size" alt="CSS Gzip Size" />
+    <img src="https://img.badgesize.io/https://unpkg.com/vant/lib/vant.min.js?compression=gzip&style=flat-square&label=JS%20gzip%20size" alt="JS Gzip Size" />
+    <img src="https://img.badgesize.io/https://unpkg.com/vant/lib/vant-css/index.css?compression=gzip&style=flat-square&label=CSS%20gzip%20size" alt="CSS Gzip Size" />
+    <img src="https://isitmaintained.com/badge/open/youzan/vant.svg" alt="issue" />
     <img src="https://img.shields.io/codecov/c/github/youzan/vant/dev.svg" alt="Coverage Status" />
 </p>
 
diff --git a/README.zh-CN.md b/README.zh-CN.md
index 92597b10e..a60a80b44 100644
--- a/README.zh-CN.md
+++ b/README.zh-CN.md
@@ -11,8 +11,9 @@
     <img src="https://img.shields.io/npm/v/vant.svg?style=flat" alt="npm version" />
     <img src="https://travis-ci.org/youzan/vant.svg?branch=master" alt="Build Status" />
     <img src="https://img.shields.io/npm/dt/vant.svg" alt="downloads" />
-    <img src="http://img.badgesize.io/https://unpkg.com/vant/lib/vant.min.js?compression=gzip&style=flat-square&label=JS%20gzip%20size" alt="JS Gzip Size" />
-    <img src="http://img.badgesize.io/https://unpkg.com/vant/lib/vant-css/index.css?compression=gzip&style=flat-square&label=CSS%20gzip%20size" alt="CSS Gzip Size" />
+    <img src="https://img.badgesize.io/https://unpkg.com/vant/lib/vant.min.js?compression=gzip&style=flat-square&label=JS%20gzip%20size" alt="JS Gzip Size" />
+    <img src="https://img.badgesize.io/https://unpkg.com/vant/lib/vant-css/index.css?compression=gzip&style=flat-square&label=CSS%20gzip%20size" alt="CSS Gzip Size" />
+    <img src="https://isitmaintained.com/badge/open/youzan/vant.svg" alt="issue" />
     <img src="https://img.shields.io/codecov/c/github/youzan/vant/dev.svg" alt="Coverage Status" />
 </p>