https://www.firebirdsql.org/en/news/firebird-4-0-beta-1-release-is-available-for-testing/...https://www.firebirdsql.org/en/firebird-4-0-0-beta1/http://web.firebirdsql.org/downloads/prerelease/v40beta1/Firebird-4.0.0_Beta1-ReleaseNotes.pdf
Firebird 4.0 Beta 1 is about to be released according to this commit:
Quote from: valdir.marcos on January 26, 2019, 07:46:50 pmhttps://www.firebirdsql.org/en/news/firebird-4-0-beta-1-release-is-available-for-testing/...https://www.firebirdsql.org/en/firebird-4-0-0-beta1/http://web.firebirdsql.org/downloads/prerelease/v40beta1/Firebird-4.0.0_Beta1-ReleaseNotes.pdfThese 3 links are all dead.
It's not yet officially released