The most current version in our database is: 1.3.3326
Is this not correct? Please feel free to update it yourself, or let us know on the Rimworld Wiki Discord!
All past versions can be found on the Category:Version page. This has a list of every version tagged by that category. This include Public, Silent, Hotfixes, Release, Alpha & Beta versions.
If there is a version that is missing, please feel free to add it! Just don't forget to tag the page with the Version Category!