diff --git a/editions/prerelease/tiddlers/Release 5.1.16.tid b/editions/prerelease/tiddlers/Release 5.1.16.tid
index 223c2b3f4..99797d55c 100644
--- a/editions/prerelease/tiddlers/Release 5.1.16.tid
+++ b/editions/prerelease/tiddlers/Release 5.1.16.tid
@@ -11,7 +11,7 @@ type: text/vnd.tiddlywiki
* New [[Dynaview Plugin]] makes it possible to build user interfaces that dynamically respond to changes in scrolling or zooming
* Improved [[Text-Slicer Plugin|Text-Slicer Edition]] with customisable JSON rules
-* Updated [[KaTeX Plugin]] to latest v0.9.0-beta
+* Updated [[KaTeX Plugin]] to latest v0.9.0
!! Translation Improvements
diff --git a/plugins/tiddlywiki/katex/files/README.md b/plugins/tiddlywiki/katex/files/README.md
index 75e881c06..a3396c1b1 100644
--- a/plugins/tiddlywiki/katex/files/README.md
+++ b/plugins/tiddlywiki/katex/files/README.md
@@ -1,5 +1,6 @@
-# [](https://khan.github.io/KaTeX/) [![Build Status](https://travis-ci.org/Khan/KaTeX.svg?branch=master)](https://travis-ci.org/Khan/KaTeX)
-
+# [](https://khan.github.io/KaTeX/)
+[![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)
KaTeX is a fast, easy-to-use JavaScript library for TeX math rendering on the web.
@@ -16,8 +17,8 @@ KaTeX supports all major browsers, including Chrome, Safari, Firefox, Opera, Edg
You can [download KaTeX](https://github.com/khan/katex/releases) and host it on your server or include the `katex.min.js` and `katex.min.css` files on your page directly from a CDN:
```html
-
-
+
+
```
#### In-browser rendering
@@ -41,6 +42,26 @@ var html = katex.renderToString("c = \\pm\\sqrt{a^2 + b^2}");
Make sure to include the CSS and font files, but there is no need to include the JavaScript. Like `render`, `renderToString` throws if it can't parse the expression.
+#### Security
+
+Any HTML generated by KaTeX *should* be safe from `