JForum 2.6.1 has been released, which addresses two issues:

It installs and runs on the Jetty servlet container.

It fixes a bug where deleting posts would cause the corresponding entry in the Moderation Log to be illegible, and break the page layout.

All users can safely upgrade, but if you aren't using Jetty, or haven't run into the moderation log issue, it may not be worth the effort.