Node 4, 6, 7, and 8 contain a major vulnerability (Constant Hashtable Seeds (CVE pending)) and it is recommended to upgrade as soon as possible
https://nodejs.org/en/blog/vulnerability/july-2017-security-releases/
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Is that out already?
Yes, though the CLI hasn’t quite caught up yet. Until it does, you can upgrade manually with
meteor upgrade --release 1.5.1
Close! 
The command is actually:
meteor update --release 1.5.1
We will officially mark Meteor 1.5.1 as recommended tomorrow and it will then become the default, but yes, you can update to it now using the above command.
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Haha, stupid typo! Thanks for the correction 