# Qiime2 2018.4 and 2018.11 greengene

**URL:** https://forum.qiime2.org/t/qiime2-2018-4-and-2018-11-greengene/7250
**Category:** User Support
**Tags:** greengenes
**Created:** [December 3, 2018, 3:36am UTC](https://forum.qiime2.org/t/qiime2-2018-4-and-2018-11-greengene/7250 "2018-12-03T03:36:20Z")
**Posts on this page:** 1
**Showing post:** 4

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### Author: ![thermokarst](https://forum.qiime2.org/letter_avatar_proxy/v4/letter/t/8e7dd6/32.png) [@thermokarst](https://forum.qiime2.org/u/thermokarst)
#### Post date: [December 4, 2018, 2:27pm UTC](https://forum.qiime2.org/t/qiime2-2018-4-and-2018-11-greengene/7250/4 "2018-12-04T14:27:02Z")

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Hey @Clara! Ah yeah, those are links to pre-trained classifiers, not the original greengenes database itself. It looks like some of the default classifier parameters [changed in 2018.6](https://forum.qiime2.org/t/qiime-2-2018-6-release-is-now-live/4692) - is it possible that that is what you are seeing? You could confirm by retraining a greengenes-based classifier using the old settings.

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