[4.0.0] - 2025-08-28

Major Changes

com.unity.ml-agents
Upgraded to Inference Engine 2.2.1 (#6212)
The minimum supported Unity version was updated to 6000.0. (#6207)
Merged the extension package com.unity.ml-agents.extensions to the main package com.unity.ml-agents. (#6227)

Minor Changes

com.unity.ml-agents
Removed broken sample from the package (#6230)
Moved to Unity Package documentation as the primary developer documentation. (#6232)
ml-agents / ml-agents-envs
Bumped grpcio version to >=1.11.0,<=1.53.2 (#6208)