You can check here for getting the latest version. Change the wget url to download newer versions.
$ wget https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.4/wkhtmltox-0.12.4_linux-generic-amd64.tar.xz
$ tar -xvf wkhtmltox-0.12.4_linux-generic-amd64.tar.xz
$ cd wkhtmltox/bin/
$ sudo mv wkhtmltopdf /usr/bin/wkhtmltopdf
$ sudo mv wkhtmltoimage /usr/bin/wkhtmltoimage
$ sudo chmod a+x /usr/bin/wkhtmltopdf
$ sudo chmod a+x /usr/bin/wkhtmltoimage
For forge, downgrade libssl.....
$ sudo apt-get install libssl1.0.0=1.0.2g-1ubuntu4
$ sudo apt-get install libssl-dev=1.0.2g-1ubuntu4