diff --git a/Readme.md b/Readme.md
index ec945c2..c72c847 100644
--- a/Readme.md
+++ b/Readme.md
@@ -87,9 +87,9 @@ $ make test
 
   MIT
 
-[npm-image]: https://img.shields.io/npm/v/koa.svg?style=flat
+[npm-image]: https://img.shields.io/npm/v/koa.svg?style=flat-square
 [npm-url]: https://npmjs.org/package/koa
-[travis-image]: https://img.shields.io/travis/koajs/koa.svg?style=flat
+[travis-image]: https://img.shields.io/travis/koajs/koa.svg?style=flat-square
 [travis-url]: https://travis-ci.org/koajs/koa
-[coveralls-image]: https://img.shields.io/coveralls/koajs/koa.svg?style=flat
+[coveralls-image]: https://img.shields.io/coveralls/koajs/koa.svg?style=flat-square
 [coveralls-url]: https://coveralls.io/r/koajs/koa?branch=master