At the end of last week, the developer announced the sixteenth maintenance update to the Linux 4.13 kernel series, versioned 4.13.16, which appears to be the last to be released for the branch. This means that Linux 4.13 won’t receive any other updates. Therefore, if you’re using a kernel from the Linux 4.13 series, you need to upgrade to Linux kernel 4.13.16 or prepare to upgrade to the latest Linux 4.14 LTS kernel, which is a long-term support release that should be maintained for the next few years.