I just switched a Sinatra application running on Heroku from using sentry-raven 1.2.2 to using sentry-raven 2.1.2 and now Sentry doesn't get the browser and OS versions correct, see this screenshot. The oldest event was created when the application was using sentry-raven 1.2.2.

Related to https://github.com/getsentry/raven-ruby/pull/560?
Please tell if you need more information on this