https://gemnasium.com/ https://gemnasium.com/ emails you when a security vulnerability arises. Otherwise, the badge on the readme changes yellow when you're out

https://gemnasium.com/ https://gemnasium.com/ emails you when a security vulnerability arises. Otherwise, the badge on the readme changes yellow when you're out of date and red when there's a vulnerability. Free for open source. See https://github.com/coreinfrastructure/best-practices-badge#core-infrastructure-initiative-best-practices-badge https://github.com/coreinfrastructure/best-practices-badge#c... for an example.