diff --git a/golang/cosmos/app/upgrade.go b/golang/cosmos/app/upgrade.go
index 6975663ce0e..7b7c3ffda01 100644
--- a/golang/cosmos/app/upgrade.go
+++ b/golang/cosmos/app/upgrade.go
@@ -19,6 +19,7 @@ var upgradeNamesOfThisVersion = []string{
 	"agoric-upgrade-18-emerynet",
 	"agoric-upgrade-18-basic",
 	"agoric-upgrade-18-basic-2",
+	"agoric-upgrade-18-emerynet-rc3",
 	"agoric-upgrade-18-a3p",
 }
 
@@ -59,7 +60,8 @@ func isPrimaryUpgradeName(name string) bool {
 		validUpgradeName("agoric-upgrade-18-basic"),
 		validUpgradeName("agoric-upgrade-18-a3p"):
 		return true
-	case validUpgradeName("agoric-upgrade-18-basic-2"):
+	case validUpgradeName("agoric-upgrade-18-basic-2"),
+		validUpgradeName("agoric-upgrade-18-emerynet-rc3"):
 		return false
 	default:
 		panic(fmt.Errorf("unexpected upgrade name %s", validUpgradeName(name)))