The noted resumption and likely a small amount of halo effect from the Comparison of Malloc() Algorithms thread two / three days ago.

- https://news.ycombinator.com/item?id=49715318

I just checked whether it's the first release after Jason Evans stepped down as maintainer, but it isn't. That was the previous release, 5.3.1

They resumed development on jemalloc only recently, after years of no releases.