[chef] Chef Nginx cookbook - override version number

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I have developed a cookbook for my application which depends on Nginx 
cookbook.
I have downloaded the Nginx cookbook from the following location

https://github.com/miketheman/nginx

and tried including the default recipe in my cookbook and overriding version
attribute specified in the default attribute file. But irrespective of what i
do, Nginx version 1.0.x is installed. I could not track from where it is
fetching the version information. Can anyone help resolving this issue?