diff --git a/CODEOWNERS b/CODEOWNERS
new file mode 100644
index 000000000000..01de8ceecb1d
--- /dev/null
+++ b/CODEOWNERS
@@ -0,0 +1 @@
+SECURITY.md @Agoric/security
diff --git a/SECURITY.md b/SECURITY.md
index 6027e3f8f479..0cc65d400b71 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -2,7 +2,7 @@
 
 ## Supported Versions
 
-The current `master` and `release-pismo` branches are supported with security updates.
+The current `master` and only the latest `agoric-upgrade-*` tagged release and pre-release are supported with security updates.
 
 ## Coordinated Vulnerability Disclosure