diff --git a/op-chain-ops/genesis/config.go b/op-chain-ops/genesis/config.go
index 7ed0a6e2f682a..69d8999880bbc 100644
--- a/op-chain-ops/genesis/config.go
+++ b/op-chain-ops/genesis/config.go
@@ -854,12 +854,6 @@ func (d *L1DependenciesConfig) CheckAddresses(dependencyContext DependencyContex
 // The genesis generation may log warnings, do a best-effort support attempt,
 // or ignore these attributes completely.
 type LegacyDeployConfig struct {
-	// CliqueSignerAddress represents the signer address for the clique consensus engine.
-	// It is used in the multi-process devnet to sign blocks.
-	CliqueSignerAddress common.Address `json:"cliqueSignerAddress"`
-	// L1UseClique represents whether or not to use the clique consensus engine.
-	L1UseClique bool `json:"l1UseClique"`
-
 	// DeploymentWaitConfirmations is the number of confirmations to wait during
 	// deployment. This is DEPRECATED and should be removed in a future PR.
 	DeploymentWaitConfirmations int `json:"deploymentWaitConfirmations"`
diff --git a/op-chain-ops/genesis/genesis.go b/op-chain-ops/genesis/genesis.go
index c852fa0fc1006..ee78368523588 100644
--- a/op-chain-ops/genesis/genesis.go
+++ b/op-chain-ops/genesis/genesis.go
@@ -11,7 +11,6 @@ import (
 	"github.com/ethereum/go-ethereum/consensus/misc/eip1559"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/params"
 )
 
@@ -141,25 +140,12 @@ func NewL1Genesis(config *DeployConfig) (*core.Genesis, error) {
 		LondonBlock:         big.NewInt(0),
 		ArrowGlacierBlock:   big.NewInt(0),
 		GrayGlacierBlock:    big.NewInt(0),
-		ShanghaiTime:        nil,
-		CancunTime:          nil,
-	}
-
-	extraData := make([]byte, 0)
-	if config.L1UseClique {
-		// warning: clique has an overly strict block header timestamp check against the system wallclock,
-		// causing blocks to get scheduled as "future block" and not get mined instantly when produced.
-		chainConfig.Clique = &params.CliqueConfig{
-			Period: config.L1BlockTime,
-			Epoch:  30000,
-		}
-		extraData = append(append(make([]byte, 32), config.CliqueSignerAddress[:]...), make([]byte, crypto.SignatureLength)...)
-	} else {
-		chainConfig.MergeNetsplitBlock = big.NewInt(0)
-		chainConfig.TerminalTotalDifficulty = big.NewInt(0)
-		chainConfig.TerminalTotalDifficultyPassed = true
-		chainConfig.ShanghaiTime = u64ptr(0)
-		chainConfig.CancunTime = u64ptr(0)
+		ShanghaiTime:        u64ptr(0),
+		CancunTime:          u64ptr(0),
+		// To enable post-Merge consensus at genesis
+		MergeNetsplitBlock:            big.NewInt(0),
+		TerminalTotalDifficulty:       big.NewInt(0),
+		TerminalTotalDifficultyPassed: true,
 	}
 
 	gasLimit := config.L1GenesisBlockGasLimit
@@ -178,7 +164,7 @@ func NewL1Genesis(config *DeployConfig) (*core.Genesis, error) {
 	if timestamp == 0 {
 		timestamp = hexutil.Uint64(time.Now().Unix())
 	}
-	if !config.L1UseClique && config.L1CancunTimeOffset != nil {
+	if config.L1CancunTimeOffset != nil {
 		cancunTime := uint64(timestamp) + uint64(*config.L1CancunTimeOffset)
 		chainConfig.CancunTime = &cancunTime
 	}
@@ -187,7 +173,7 @@ func NewL1Genesis(config *DeployConfig) (*core.Genesis, error) {
 		Config:        &chainConfig,
 		Nonce:         uint64(config.L1GenesisBlockNonce),
 		Timestamp:     uint64(timestamp),
-		ExtraData:     extraData,
+		ExtraData:     make([]byte, 0),
 		GasLimit:      uint64(gasLimit),
 		Difficulty:    difficulty.ToInt(),
 		Mixhash:       config.L1GenesisBlockMixHash,
diff --git a/op-chain-ops/genesis/testdata/test-deploy-config-full.json b/op-chain-ops/genesis/testdata/test-deploy-config-full.json
index 814fff245b0d1..7fe9a78e71549 100644
--- a/op-chain-ops/genesis/testdata/test-deploy-config-full.json
+++ b/op-chain-ops/genesis/testdata/test-deploy-config-full.json
@@ -6,8 +6,6 @@
   "maxSequencerDrift": 20,
   "sequencerWindowSize": 100,
   "channelTimeout": 30,
-  "l1UseClique": false,
-  "cliqueSignerAddress": "0x0000000000000000000000000000000000000000",
   "customGasTokenAddress": "0x0000000000000000000000000000000000000000",
   "p2pSequencerAddress": "0x9965507d1a55bcc2695c58ba16fb37d819b0a4dc",
   "batchInboxAddress": "0x42000000000000000000000000000000000000ff",
diff --git a/op-e2e/config/init.go b/op-e2e/config/init.go
index 9419c1277060d..032f70bf2a883 100644
--- a/op-e2e/config/init.go
+++ b/op-e2e/config/init.go
@@ -201,9 +201,6 @@ func initAllocType(root string, allocType AllocType) {
 		panic(err)
 	}
 
-	// Do not use clique in the in memory tests. Otherwise block building
-	// would be much more complex.
-	dc.L1UseClique = false
 	// Set the L1 genesis block timestamp to now
 	dc.L1GenesisBlockTimestamp = hexutil.Uint64(time.Now().Unix())
 	dc.FundDevAccounts = true
diff --git a/op-e2e/e2eutils/secrets.go b/op-e2e/e2eutils/secrets.go
index cd4c91e1e09e5..9cee2f25c4c1f 100644
--- a/op-e2e/e2eutils/secrets.go
+++ b/op-e2e/e2eutils/secrets.go
@@ -19,8 +19,8 @@ const defaultHDPathPrefix = "m/44'/60'/0'/0/"
 // If these values are changed, it is subject to breaking tests. They
 // must be in sync with the values in the DeployConfig used to create the system.
 var DefaultMnemonicConfig = &MnemonicConfig{
-	Mnemonic:     "test test test test test test test test test test test junk",
-	CliqueSigner: "m/44'/60'/0'/0/0",
+	Mnemonic: "test test test test test test test test test test test junk",
+	// Note: "m/44'/60'/0'/0/0" is a legacy mnemonic path, used for the L1 clique signer.
 	Proposer:     "m/44'/60'/0'/0/1",
 	Batcher:      "m/44'/60'/0'/0/2",
 	Deployer:     "m/44'/60'/0'/0/3",
@@ -36,9 +36,8 @@ var DefaultMnemonicConfig = &MnemonicConfig{
 type MnemonicConfig struct {
 	Mnemonic string
 
-	CliqueSigner string
-	Deployer     string
-	SysCfgOwner  string
+	Deployer    string
+	SysCfgOwner string
 
 	// rollup actors
 	Proposer     string
@@ -66,10 +65,6 @@ func (m *MnemonicConfig) Secrets() (*Secrets, error) {
 	if err != nil {
 		return nil, err
 	}
-	cliqueSigner, err := wallet.PrivateKey(account(m.CliqueSigner))
-	if err != nil {
-		return nil, err
-	}
 	sysCfgOwner, err := wallet.PrivateKey(account(m.SysCfgOwner))
 	if err != nil {
 		return nil, err
@@ -102,7 +97,6 @@ func (m *MnemonicConfig) Secrets() (*Secrets, error) {
 	return &Secrets{
 		Deployer:     deployer,
 		SysCfgOwner:  sysCfgOwner,
-		CliqueSigner: cliqueSigner,
 		Proposer:     proposer,
 		Batcher:      batcher,
 		SequencerP2P: sequencerP2P,
@@ -115,9 +109,8 @@ func (m *MnemonicConfig) Secrets() (*Secrets, error) {
 
 // Secrets bundles secp256k1 private keys for all common rollup actors for testing purposes.
 type Secrets struct {
-	Deployer     *ecdsa.PrivateKey
-	CliqueSigner *ecdsa.PrivateKey
-	SysCfgOwner  *ecdsa.PrivateKey
+	Deployer    *ecdsa.PrivateKey
+	SysCfgOwner *ecdsa.PrivateKey
 
 	// rollup actors
 	Proposer     *ecdsa.PrivateKey
@@ -138,7 +131,6 @@ type Secrets struct {
 func (s *Secrets) Addresses() *Addresses {
 	return &Addresses{
 		Deployer:     crypto.PubkeyToAddress(s.Deployer.PublicKey),
-		CliqueSigner: crypto.PubkeyToAddress(s.CliqueSigner.PublicKey),
 		SysCfgOwner:  crypto.PubkeyToAddress(s.SysCfgOwner.PublicKey),
 		Proposer:     crypto.PubkeyToAddress(s.Proposer.PublicKey),
 		Batcher:      crypto.PubkeyToAddress(s.Batcher.PublicKey),
@@ -151,9 +143,8 @@ func (s *Secrets) Addresses() *Addresses {
 
 // Addresses bundles the addresses for all common rollup addresses for testing purposes.
 type Addresses struct {
-	Deployer     common.Address
-	CliqueSigner common.Address
-	SysCfgOwner  common.Address
+	Deployer    common.Address
+	SysCfgOwner common.Address
 
 	// rollup actors
 	Proposer     common.Address
@@ -169,7 +160,6 @@ type Addresses struct {
 func (a *Addresses) All() []common.Address {
 	return []common.Address{
 		a.Deployer,
-		a.CliqueSigner,
 		a.SysCfgOwner,
 		a.Proposer,
 		a.Batcher,
diff --git a/op-wheel/cheat/cheat.go b/op-wheel/cheat/cheat.go
index 4b2d428e1029b..1b5089c283648 100644
--- a/op-wheel/cheat/cheat.go
+++ b/op-wheel/cheat/cheat.go
@@ -138,7 +138,7 @@ func (ch *Cheater) RunAndClose(fn HeadFn) error {
 
 	// Geth stores the TD for each block separately from the block itself. We must update this
 	// manually, otherwise Geth thinks we haven't reached TTD yet and tries to build a block
-	// using Clique consensus, which causes a panic.
+	// using pre-merge consensus, which causes a panic.
 	rawdb.WriteTd(batch, blockHash, preID.Number, ch.Blockchain.GetTd(preID.Hash, preID.Number))
 
 	// Need to copy over receipts since they are keyed by block hash.
diff --git a/packages/contracts-bedrock/deploy-config/sepolia-devnet-0.json b/packages/contracts-bedrock/deploy-config/sepolia-devnet-0.json
index 4239d10c3d071..8cc17a8f668d6 100644
--- a/packages/contracts-bedrock/deploy-config/sepolia-devnet-0.json
+++ b/packages/contracts-bedrock/deploy-config/sepolia-devnet-0.json
@@ -15,8 +15,6 @@
   "l2OutputOracleStartingBlockNumber": 0,
   "l2OutputOracleProposer": "0x95014c45078354ff839f14192228108eac82e00a",
   "l2OutputOracleChallenger": "0x8c20c40180751d93e939dddee3517ae0d1ebead2",
-  "cliqueSignerAddress": "0x0000000000000000000000000000000000000000",
-  "l1UseClique": false,
   "l1BlockTime": 12,
   "l1GenesisBlockTimestamp": "0x0",
   "l1GenesisBlockNonce": "0x0",