diff --git a/build/params_calibnet.go b/build/params_calibnet.go
index ed6dd645d..3a206b1a7 100644
--- a/build/params_calibnet.go
+++ b/build/params_calibnet.go
@@ -76,8 +76,8 @@ const UpgradeHyggeHeight = 322354
 // 2023-04-18T16:30:00Z
 const UpgradeLightningHeight = 483634
 
-// 2023-04-18T20:30:00Z
-const UpgradeThunderHeight = UpgradeLightningHeight + 480
+// 2023-04-20T16:30:00Z
+const UpgradeThunderHeight = UpgradeLightningHeight + 5760
 
 var SupportedProofTypes = []abi.RegisteredSealProof{
 	abi.RegisteredSealProof_StackedDrg32GiBV1,