Updated link to peepcode Git screencast

guides/source/development_dependencies_install.md

@@ -24,7 +24,7 @@ Ruby on Rails uses Git for source code control. The [Git homepage](http://git-sc
 * [Try Git course](http://try.github.io/) is an interactive course that will teach you the basics.
 * The [official Documentation](http://git-scm.com/documentation) is pretty comprehensive and also contains some videos with the basics of Git
 * [Everyday Git](http://schacon.github.io/git/everyday.html) will teach you just enough about Git to get by.
-* The [PeepCode screencast](https://peepcode.com/products/git) on Git ($9) is easier to follow.
+* The [PeepCode screencast](https://peepcode.com/products/git) on Git ($12) is easier to follow.
 * [GitHub](http://help.github.com) offers links to a variety of Git resources.
 * [Pro Git](http://git-scm.com/book) is an entire book about Git with a Creative Commons license.