Bastien tweets that there’s a new Org mode release:
#orgmode #emacs 9.1.8 is out, with important bugfixes for those using group tags (I know you are…) Enjoy!
— Bastien Guerry (@bzg2) March 22, 2018
It’s already available in Org ELPA repository
(https://orgmode.org/elpa/) so you can install it at your leisure.