Odd that there is no mention here of a new release:
http://zsh.sourceforge.net

> On Sep 1, 2015, at 6:12 AM, SourceForge.net <noreply-updater@sourceforge.net> wrote:
> 
> 
> 	
> Find, Create, & Publish Open Source Software for free.
> Hi! You have an update available.
> zsh
> 
> zsh-5.1.tar.gz
> Released on 2015-09-01
> 
> Download Latest Version
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