FITS 1.5.5 is the latest stable release and was released on May 10, 2022. It does not contain any work from the Community Sprint. Its primary change from the previous release is that it resolves a log4j (v.1) security vulnerability by replacing log4j with reload4j. There has also been the upgrade to the latest version of OTS 1.0.58.
The code for this release is in the 1.5.5-LIBDRS-8598_Upgrade_log4j.
The executable code is in the ZIP file here.