- "**NB: This is nbdev v2, a new from-scratch rewrite of nbdev that's not backwards compatible. Whilst the differences to nbdev1 aren't huge, it does require some changes. So if you wish to continue to use nbdev1 until you've got the time to upgrade, you can find the old version docs at [nbdev1.fast.ai](https://nbdev1.fast.ai). You can use version-pinning in your `requirements.txt` or `settings.ini` (i.e use `'nbdev<2'` as your dependency) to stop nbdev from being upgraded. To upgrade to to nbdev2, follow the steps in the [migration tutorial](/migrating.html).**\n",
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