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I have the sass requirement of "= 3.1.15" and the current is listed as "3.1.10" which is marking the dependency as behind.
Thank you, I'm looking into it now!
It's worked out now. The sass gem had been erroring out on stable version releases. I haven't been able to track down the cause yet but its dependencies have been brought up to date in the meantime. Sorry for the inconvenience!