diff --git a/README.md b/README.md
index a1b3b072..f00133df 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,7 @@
 [![Build Status](https://travis-ci.org/Khan/KaTeX.svg?branch=master)](https://travis-ci.org/Khan/KaTeX)
 [![codecov](https://codecov.io/gh/Khan/KaTeX/branch/master/graph/badge.svg)](https://codecov.io/gh/Khan/KaTeX)
 [![Join the chat at https://gitter.im/Khan/KaTeX](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/Khan/KaTeX?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+![](https://img.badgesize.io/Khan/KaTeX/v0.9.0/dist/katex.min.js?compression=gzip)
 
 KaTeX is a fast, easy-to-use JavaScript library for TeX math rendering on the web.
 
diff --git a/update-sri.js b/update-sri.js
index 7277514f..3c966af3 100644
--- a/update-sri.js
+++ b/update-sri.js
@@ -19,6 +19,15 @@ function write(file, data) {
 Promise.all(process.argv.slice(3).map(file =>
     read(file, "utf8")
     .then(body => {
+        // Replace size badge url
+        // 1 - url prefix: https://img.badgesize.io/Khan/KaTeX/
+        // 2 - url suffix: /dist/katex.min.js?compression=gzip 
+        const badgeRe = /(https:\/\/img\.badgesize\.io\/Khan\/KaTeX\/)(?:.+)(\/dist\/katex\.min\.js\?compression=gzip)/g;
+        body = body.replace(badgeRe, (m, pre, post) => {
+            return pre + version + post;
+        });
+
+        // Replace CDN urls
         // 1 - url prefix: "http…/KaTeX/
         // 2 - opening quote: "
         // 3 - preserved suffix: /katex.min.js" integrity="…"
@@ -26,9 +35,9 @@ Promise.all(process.argv.slice(3).map(file =>
         // 5 - integrity opening quote: "
         // 6 - old hash: sha384-…
         // 7 - integrity hash algorithm: sha384
-        const re = /((["'])https?:\/\/cdn\.jsdelivr\.net\/npm\/katex@)[^\/"']+(\/([^"']+)\2(?:\s+integrity=(["'])(([^-]+)-[^"']+)\5)?)/g;
+        const cdnRe = /((["'])https?:\/\/cdn\.jsdelivr\.net\/npm\/katex@)[^\/"']+(\/([^"']+)\2(?:\s+integrity=(["'])(([^-]+)-[^"']+)\5)?)/g;
         const hashes = {};
-        body = body.replace(re, (m, pre, oq1, post, file, oq2, old, algo) => {
+        body = body.replace(cdnRe, (m, pre, oq1, post, file, oq2, old, algo) => {
             if (old) {
                 hashes[old] = { file, algo };
             }