diff --git a/params/config.go b/params/config.go
index 8073d34023..577337c965 100644
--- a/params/config.go
+++ b/params/config.go
@@ -36,6 +36,7 @@ const (
 	OPGoerliChainID         = 420
 	BaseMainnetChainID      = 8453
 	BaseGoerliChainID       = 84531
+	baseSepoliaChainID      = 84532
 	baseGoerliDevnetChainID = 11763071
 	devnetChainID           = 997
 	chaosnetChainID         = 888
diff --git a/params/superchain.go b/params/superchain.go
index 391e75589d..007502c6ce 100644
--- a/params/superchain.go
+++ b/params/superchain.go
@@ -105,6 +105,9 @@ func LoadOPStackChainConfig(chainID uint64) (*ChainConfig, error) {
 		out.BedrockBlock = big.NewInt(105235063)
 	case BaseGoerliChainID:
 		out.RegolithTime = &BaseGoerliRegolithTime
+		out.Optimism.EIP1559Elasticity = 10
+	case baseSepoliaChainID:
+		out.Optimism.EIP1559Elasticity = 10
 	case baseGoerliDevnetChainID:
 		out.RegolithTime = &baseGoerliDevnetRegolithTime
 	case devnetChainID: