Kernel Version Update Complete for All Heroku Apps

Change effective on 19 April 2024

Late last year, we began a Heroku Platform upgrade to bring all Heroku applications to a more modern Linux kernel version. This was a non-breaking change and no customer action was required to receive the upgrade.

The updated kernel has new features and system calls such as io_uring and epoll_pwait2 that may unlock performance improvements for some apps. See the roadmap for more discussion.

This changelog indicates that the upgrade is complete, and all Heroku applications are now running on the updated kernel version.