Corda 4 has been released
Corda v4 has officially been released! Many new features and improvements have been added. You can view the full list of release notes here.

Looking to upgrade your Corda v3.x application, visit here for instructions.

Main Changes:
-Reference states
-Signature constraints
-State pointers
-GUI network setup tool
-JPA access in flows and services
-Various security upgrades
-Network parameters now included in transactions
-Various dependency upgrades