Recently I updated rake on a project and was met with this warning:

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WARNING: 'task :t, arg, :needs => [deps]' is deprecated.  Please use 'task :t, [args] => [deps]' instead.

It wasn’t immediately obvious to me what exactly the needed change was, and much googling didn’t reveal anything helpful. However blind poking about did. Turns out it means one should change this:

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task :staging, :post, :needs  => :environment do |t, args|

to this:

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task :staging, [:post]  => :environment do |t, args|