Hi, screen-4.5.0 was released yesterday. Mostly bugfixes, should be easy to update.
commit 07ee19f69750791981e0efda6b731c289bfdadc2 Author: Jeroen Roovers <jer@gentoo.org> Date: Wed Jan 18 13:19:53 2017 app-misc/screen: Version bump. Package-Manager: Portage-2.3.3, Repoman-2.3.1