# [Ride v4 and v3] Standard Library Versions 4 and 3
⚠️ We recommend to use Standard library version 6 for application development.
Standard library version 4 is enabled by feature #15 “Ride V4, VRF, Protobuf, Failed transactions”.
Version differences are presented in the [Ride v5, v4, v3] Previous Versions of Standard Library article.