diff --git a/op-e2e/actions/dencun_fork_test.go b/op-e2e/actions/dencun_fork_test.go
new file mode 100644
index 000000000000..7b01a92a5210
--- /dev/null
+++ b/op-e2e/actions/dencun_fork_test.go
@@ -0,0 +1,53 @@
+package actions
+
+import (
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/stretchr/testify/require"
+
+	"github.com/ethereum-optimism/optimism/op-e2e/e2eutils"
+	"github.com/ethereum-optimism/optimism/op-service/testlog"
+)
+
+func TestDencunL1Fork(gt *testing.T) {
+	t := NewDefaultTesting(gt)
+	dp := e2eutils.MakeDeployParams(t, defaultRollupTestParams)
+	sd := e2eutils.Setup(t, dp, defaultAlloc)
+	activation := sd.L1Cfg.Timestamp + 24
+	sd.L1Cfg.Config.CancunTime = &activation
+	log := testlog.Logger(t, log.LvlDebug)
+	_, _, miner, sequencer, _, verifier, _, batcher := setupReorgTestActors(t, dp, sd, log)
+
+	l1Head := miner.l1Chain.CurrentBlock()
+	require.False(t, sd.L1Cfg.Config.IsCancun(l1Head.Number, l1Head.Time), "Cancun not active yet")
+
+	// start op-nodes
+	sequencer.ActL2PipelineFull(t)
+	verifier.ActL2PipelineFull(t)
+
+	// build empty L1 blocks, crossing the fork boundary
+	miner.ActL1SetFeeRecipient(common.Address{'A', 0})
+	miner.ActEmptyBlock(t)
+	miner.ActEmptyBlock(t) // Cancun activates here
+	miner.ActEmptyBlock(t)
+	// verify Cancun is active
+	l1Head = miner.l1Chain.CurrentBlock()
+	require.True(t, sd.L1Cfg.Config.IsCancun(l1Head.Number, l1Head.Time), "Cancun active")
+
+	// build L2 chain up to and including L2 blocks referencing Cancun L1 blocks
+	sequencer.ActL1HeadSignal(t)
+	sequencer.ActBuildToL1Head(t)
+	miner.ActL1StartBlock(12)(t)
+	batcher.ActSubmitAll(t)
+	miner.ActL1IncludeTx(batcher.batcherAddr)(t)
+	miner.ActL1EndBlock(t)
+
+	// sync verifier
+	verifier.ActL1HeadSignal(t)
+	verifier.ActL2PipelineFull(t)
+	// verify verifier accepted Cancun L1 inputs
+	require.Equal(t, l1Head.Hash(), verifier.SyncStatus().SafeL2.L1Origin.Hash, "verifier synced L1 chain that includes Cancun headers")
+	require.Equal(t, sequencer.SyncStatus().UnsafeL2, verifier.SyncStatus().UnsafeL2, "verifier and sequencer agree")
+}
diff --git a/op-e2e/actions/l1_miner.go b/op-e2e/actions/l1_miner.go
index 8ba3ee857b67..56f508d095d2 100644
--- a/op-e2e/actions/l1_miner.go
+++ b/op-e2e/actions/l1_miner.go
@@ -76,6 +76,13 @@ func (s *L1Miner) ActL1StartBlock(timeDelta uint64) Action {
 		if s.l1Cfg.Config.IsShanghai(header.Number, header.Time) {
 			header.WithdrawalsHash = &types.EmptyWithdrawalsHash
 		}
+		if s.l1Cfg.Config.IsCancun(header.Number, header.Time) {
+			var root common.Hash
+			var zero uint64
+			header.BlobGasUsed = &zero
+			header.ExcessBlobGas = &zero
+			header.ParentBeaconRoot = &root
+		}
 
 		s.l1Building = true
 		s.l1BuildingHeader = header
diff --git a/op-service/sources/types.go b/op-service/sources/types.go
index 7ccf4c3b65c5..90c0002018c3 100644
--- a/op-service/sources/types.go
+++ b/op-service/sources/types.go
@@ -103,7 +103,16 @@ type rpcHeader struct {
 	BaseFee *hexutil.Big `json:"baseFeePerGas"`
 
 	// WithdrawalsRoot was added by EIP-4895 and is ignored in legacy headers.
-	WithdrawalsRoot *common.Hash `json:"withdrawalsRoot"`
+	WithdrawalsRoot *common.Hash `json:"withdrawalsRoot,omitempty"`
+
+	// BlobGasUsed was added by EIP-4844 and is ignored in legacy headers.
+	BlobGasUsed *hexutil.Uint64 `json:"blobGasUsed,omitempty"`
+
+	// ExcessBlobGas was added by EIP-4844 and is ignored in legacy headers.
+	ExcessBlobGas *hexutil.Uint64 `json:"excessBlobGas,omitempty"`
+
+	// ParentBeaconRoot was added by EIP-4788 and is ignored in legacy headers.
+	ParentBeaconRoot *common.Hash `json:"parentBeaconBlockRoot,omitempty"`
 
 	// untrusted info included by RPC, may have to be checked
 	Hash common.Hash `json:"hash"`
@@ -156,6 +165,10 @@ func (hdr *rpcHeader) createGethHeader() *types.Header {
 		Nonce:           hdr.Nonce,
 		BaseFee:         (*big.Int)(hdr.BaseFee),
 		WithdrawalsHash: hdr.WithdrawalsRoot,
+		// Cancun
+		BlobGasUsed:      (*uint64)(hdr.BlobGasUsed),
+		ExcessBlobGas:    (*uint64)(hdr.ExcessBlobGas),
+		ParentBeaconRoot: hdr.ParentBeaconRoot,
 	}
 }
 
@@ -185,7 +198,7 @@ func (block *rpcBlock) verify() error {
 	}
 	for i, tx := range block.Transactions {
 		if tx == nil {
-			return fmt.Errorf("block tx %d is null", i)
+			return fmt.Errorf("block tx %d is nil", i)
 		}
 	}
 	if computed := types.DeriveSha(types.Transactions(block.Transactions), trie.NewStackTrie(nil)); block.TxHash != computed {