Heads up! This blog post hasn't been updated in over 2 years. CodePen is an ever changing place, so if this post references features, you're probably better off checking the docs. Get in touch with support if you have further questions.

What version of Sass are you running? What version of Compass? What version of anything? We have a page for that now.

versions
As of January 20, 2014

We try and stay up to date on stable versions of stuff. But if we get behind, request an upgrade.