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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 4.x.x   | :white_check_mark: |
+| < 3.1.x | :x:                |
+
+## Reporting a Vulnerability
+
+Hiro Systems operates a bug bounty programme on [HackerOne](https://hackerone.com/blockstack?type=team)
+
+[Read more about the programme on our blog.](https://forum.stacks.org/t/stacks-2-0-testnet-bounty-program-find-bugs-build-tools/10888)