As @pitaj says, we recommend Node v6, although come October, we'll switch to recommending v8 :shipit:
Version History & Roadmap
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https://github.com/NodeBB/NodeBB/wiki/Version-History-&-Roadmap
this is forgotten
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It would be nice to see an updated roadmap of future releases
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that page in the wiki was just a list of all the included items from the issue tracker. you can get that from NodeBB's github page.