# Versions of the Open Tree Reference Taxonomy (OTT)

* [Version 3.5](ott3.5.md) 2023-05-22
* [Version 3.4](ott3.4.md) 2022-10-31
* [Version 3.3](ott3.3.md) 2021-06-01
* [Version 3.2](ott3.2.md) 2019-10-30
* [Version 3.1](ott3.1.md) 2019-09-16
* [Version 3.0](ott3.0.md) 2017-02-26
* [Version 2.9](ott2.9.md) 2015-07-25
* [Version 2.8](ott2.8.md) 2014-06-12
* [Version 2.7](ott2.7.md) 2014-05-08
* [Version 2.6](ott2.6.md) 2014-04-11
* Version 2.5 2014-03-28 (no release notes) [gzipped tar file, 83 Mbyte](https://files.opentreeoflife.org/ott/ott2.5/ott2.5.tgz)
* [Version 2.4](ott2.4.md) 2014-03-17
* [Version 2.3](ott2.3.md) 2013-12-04
* Version 2.2 2013-09-15 (no release notes) [gzipped tar file, 123 Mbyte](https://files.opentreeoflife.org/ott/ott2.2/ott2.2.tgz)
* [Version 2.1](ott2.1.md) 2013-07-16
* [Version 2.0](ott2.0.md) 2013-05-31
* [Version 1.0](ott1.0.md) 2013-03-16

* preOTToL 2012-11-12 [TSV file, 185 Mbyte](https://bitbucket.org/mtholder/ottol/raw/dc0f89986c6c2a244b366312a76bae8c7be15742/preOTToL_20121112.txt)
* preOTToL 2012-06-19 [CSV file, 65 Mbyte](https://bitbucket.org/blackrim/avatol-taxonomies/downloads/OTToL061912.txt)