diff --git a/README.md b/README.md
index 65a9c30..9dc3b13 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,8 @@
 # letter_opener_web
 
-[![Build Status](https://travis-ci.org/fgrehm/letter_opener_web.png?branch=master)](https://travis-ci.org/fgrehm/letter_opener_web)
-[![Gem Version](https://badge.fury.io/rb/letter_opener_web.png)](http://badge.fury.io/rb/letter_opener_web)
-[![Code Climate](https://codeclimate.com/github/fgrehm/letter_opener_web.png)](https://codeclimate.com/github/fgrehm/letter_opener_web)
+[![Build Status](https://travis-ci.org/fgrehm/letter_opener_web.svg?branch=master)](https://travis-ci.org/fgrehm/letter_opener_web)
+[![Gem Version](https://badge.fury.io/rb/letter_opener_web.svg)](http://badge.fury.io/rb/letter_opener_web)
+[![Code Climate](https://codeclimate.com/github/fgrehm/letter_opener_web.svg)](https://codeclimate.com/github/fgrehm/letter_opener_web)
 
 Gives [letter_opener](https://github.com/ryanb/letter_opener) an interface for
 browsing sent emails.