How to update Ruby 2.2.4 to 2.2..5

The reason I need to update to 2.2.5 is because whenever I run bundle install I'm receiving an error:

ERROR: Error installing ruby_dep:

ruby_dep requires Ruby version >= 2.2.5, ~> 2.2.

So I guess in order to avoid this I need to update to 2.2.5 I went to http://ift.tt/1qPi5SY and I downloaded the first link. I ended up with a ZIP file that I have no clue what to do with. I tried another method with: $ ruby update --system but got in return

c:\RailsInstaller\Ruby2.2.0\bin\ruby.exe: No such file or directory -- update (LoadError)

What should I do? Note: I'm using windows