# Update HUMANN3 database locations

**URL:** <https://forum.biobakery.org/t/update-humann3-database-locations/1761>\
**Category:** HUMAnN\
**Created:** [March 10, 2021, 10:17am UTC](https://forum.biobakery.org/t/update-humann3-database-locations/1761 "2021-03-10T10:17:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![BioMickWatson](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.biobakery.org/biomickwatson/32/359_2.png) [@BioMickWatson](https://forum.biobakery.org/u/BioMickWatson)\
**Post date:** [March 10, 2021, 10:17am UTC](https://forum.biobakery.org/t/update-humann3-database-locations/1761/1 "2021-03-10T10:17:58Z")

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How do I update the location of the humann3 databases? Without re-downloading them?

Where is the config for the database locations stored?

Why I am asking: I have a humann3 installation that insists on re-downloading databases every time I run it

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**Author:** ![lauren.j.mciver](https://avatars.discourse-cdn.com/v4/letter/l/f05b48/32.png) [@lauren.j.mciver](https://forum.biobakery.org/u/lauren.j.mciver)\
**Post date:** [March 10, 2021, 8:22pm UTC](https://forum.biobakery.org/t/update-humann3-database-locations/1761/2 "2021-03-10T20:22:33Z")

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Hello, You can update the default database locations with the tool `humann_config`. For more information see the user manual: [HUMAnN User Manual Config section](https://github.com/biobakery/humann#configuration). This tool will also allow you to check your current configuration settings. Alternatively you can specify the locations of the databases when you run HUMAnN using the options `--protein-database <db>` and `--nucleotide-database <db>`.

Thank you,  
Lauren