diff --git a/core/vm/contracts.go b/core/vm/contracts.go
index 36d33e41c..adb10883e 100644
--- a/core/vm/contracts.go
+++ b/core/vm/contracts.go
@@ -78,9 +78,6 @@ var PrecompiledContractsIstanbul = map[common.Address]PrecompiledContract{
 	common.BytesToAddress([]byte{7}): &bn256ScalarMulIstanbul{},
 	common.BytesToAddress([]byte{8}): &bn256PairingIstanbul{},
 	common.BytesToAddress([]byte{9}): &blake2F{},
-
-	common.BytesToAddress([]byte{100}): &tmHeaderValidate{},
-	common.BytesToAddress([]byte{101}): &iavlMerkleProofValidate{},
 }
 
 var PrecompiledContractsNano = map[common.Address]PrecompiledContract{
diff --git a/core/vm/jump_table.go b/core/vm/jump_table.go
index 70c543f14..65716f944 100644
--- a/core/vm/jump_table.go
+++ b/core/vm/jump_table.go
@@ -91,7 +91,7 @@ func newCancunInstructionSet() JumpTable {
 }
 
 func newShanghaiInstructionSet() JumpTable {
-	instructionSet := newLondonInstructionSet()
+	instructionSet := newMergeInstructionSet()
 	enable3855(&instructionSet) // PUSH0 instruction
 	enable3860(&instructionSet) // Limit and meter initcode
 
diff --git a/params/protocol_params.go b/params/protocol_params.go
index b32b4d943..8b544af08 100644
--- a/params/protocol_params.go
+++ b/params/protocol_params.go
@@ -23,7 +23,7 @@ import (
 )
 
 const (
-	GasLimitBoundDivisor uint64 = 256                // The bound divisor of the gas limit, used in update calculations.
+	GasLimitBoundDivisor uint64 = 1024               // The bound divisor of the gas limit, used in update calculations.
 	MinGasLimit          uint64 = 5000               // Minimum the gas limit may ever be.
 	MaxGasLimit          uint64 = 0x7fffffffffffffff // Maximum the gas limit (2^63-1).
 	GenesisGasLimit      uint64 = 4712388            // Gas limit of the Genesis block.