There is a ton of changes to find with FreeBSD 13.4 that have accumulated over the past number of months. There are many security fixes can be found in FreeBSD 13.4 affecting various components. There are also many program updates including LLVM Clang 18.1.5, SQLite 3.46, OpenSSH 9.7p1, libarchive 3.7.4, and others.
Kernel-side there are updates to the Intel IRDMA and ICE drivers, SIM7600G support added to the U3G driver, and stability fixes to the wireless drivers -- including those using the Linux KPI.
FreeBSD 13.4 also brings performance improvements and other enhancements to its network stack. Also on the hardware side is AMD Ryzen 7040 series "Phoenix" support added to the AMDSMN and AMDTEMP drivers.
More details on FreeBSD 13.4 and downloads via the release announcement . There are also the release notes that dive further into all the interesting changes in 13.4-RELEASE.