Follow the instructions to update ssh on the latest version.
The process requires patching the current source, which is unfortunately not written anywhere in the open-ssh website.
Package Information
-Download (HTTP): http://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-7.5p1.tar.gz
Download MD5 sum: 652fdc7d8392f112bef11cacf7e69e23
Download size: 1.