diff --git a/build/params_testnet.go b/build/params_testnet.go
index 78d26f0d191..312ee6dd53b 100644
--- a/build/params_testnet.go
+++ b/build/params_testnet.go
@@ -12,7 +12,7 @@ import (
 	"github.com/filecoin-project/specs-actors/actors/builtin/power"
 )
 
-const UpgradeBreezeHeight = 42000
+const UpgradeBreezeHeight = 41280
 const BreezeGasTampingDuration = 120
 
 func init() {