the latest release of app-crypt/dehydrated is 0.6.2. the last version in portage is 0.6.1. i just came across a nasty bug that prevents certificate renewal. according to the author, it has been already fixed in 0.6.2. see https://github.com/lukas2511/dehydrated/issues/555#issuecomment-386071551 for more details.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=1b7a46ae4ebf80af7f380f4f1af148369980c6d7 commit 1b7a46ae4ebf80af7f380f4f1af148369980c6d7 Author: Marc Schiffbauer <mschiff@gentoo.org> AuthorDate: 2018-05-03 08:05:39 +0000 Commit: Marc Schiffbauer <mschiff@gentoo.org> CommitDate: 2018-05-03 08:06:21 +0000 app-crypt/dehydrated: bump version Closes: https://bugs.gentoo.org/654652 Package-Manager: Portage-2.3.28, Repoman-2.3.9 app-crypt/dehydrated/Manifest | 1 + app-crypt/dehydrated/dehydrated-0.6.2.ebuild | 64 ++++++++++++++++++++++++++++ 2 files changed, 65 insertions(+)