Sentry-native 0.3.0 and on-premise

SDKs
1

The release notes for sentry-native 0.3.0 includes the following note:

Always send the newer x-sentry-envelope format, which makes this incompatible with older on-premise installations.

Can you advise which specific version of on-premise we need to be on before we move to version 0.3.0 of sentry-native?