This SDK release supports Protocol 18.
You should upgrade to the latest version of this SDK as soon as possible: it is required for full compatibility once Protocol 18 is live. There are changes to Stellar's binary protocol that are not backwards compatible, and earlier versions may soon provide an incomplete or broken picture of the network.
For a comprehensive list of changes to the library, you can refer to the notes for the pre-release versions:
Changes in this version since the last beta release are as follows: