Released on June 27th, 2021, Linux kernel 5.13 was one of the bigger releases in the Linux 5.x series with over 16,000 commits contributed by more than 2000 developers. It introduced initial FreeSync HDMI support for AMD GPUs, initial support for Apple’s M1 processor, and support for the Landlock security module.
On September 18th, 2021, renowned Linux kernel developer Greg Kroah-Hartman published what appeared to be the last maintenance update to the Linux kernel 5.13 series, Linux 5.13.19, saying that the branch is now end-of-life and urging everyone to upgrade to the latest Linux 5.14 kernel series.