The recommendation is to use the latest version available.
| Version | Supported |
|---|---|
| 4.x | :white_check_mark::white_check_mark: |
| 3.4 | :white_check_mark: |
| 2.5 | :white_check_mark: |
| < 2.0 | :x: |
Please report any security issues you find to security@openzeppelin.org.
Critical bug fixes will be backported to past major releases.