Is bar_label a feature of matplotlib 3.4.x only?

Recently, using matplolib 3.4.x I saw the new implementation of bar_label which makes annotation work much easier. However, when I did a fresh install of matplotlib (without specifying the version) the most recent (3.5.1) was installed. In this version, bar_label is not implemented. Since matplotlib is part of the dependencies of my projects, I would like to know if this functionality will be exclusive to v3.4.x, or will it eventually be implemented in new versions?
Mario S.

Bar label was mot removed matplotlib.pyplot.bar_label — Matplotlib 3.5.1 documentation. Suggest you check your install.

Oh, I definitely mixed conda environments, apparently with an older version. Thanks for your reply.