diff --git a/docs/index.md b/docs/index.md
index 5c3b63db..d264093b 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -11,12 +11,12 @@ Prettier is an opinionated code formatter with support for:
 - [Vue](https://vuejs.org/)
 - [Flow](https://flow.org/)
 - [TypeScript](https://www.typescriptlang.org/)
-- CSS, [Less](http://lesscss.org/), and [SCSS](http://sass-lang.com)
+- CSS, [Less](http://lesscss.org/), and [SCSS](https://sass-lang.com)
 - [HTML](https://en.wikipedia.org/wiki/HTML)
 - [JSON](http://json.org/)
-- [GraphQL](http://graphql.org/)
-- [Markdown](http://commonmark.org/), including [GFM](https://github.github.com/gfm/) and [MDX](https://mdxjs.com/)
-- [YAML](http://yaml.org/)
+- [GraphQL](https://graphql.org/)
+- [Markdown](https://commonmark.org/), including [GFM](https://github.github.com/gfm/) and [MDX](https://mdxjs.com/)
+- [YAML](https://yaml.org/)
 
 It removes all original styling[\*](#footnotes) and ensures that all outputted code conforms to a consistent style. (See this [blog post](http://jlongster.com/A-Prettier-Formatter))