diff --git a/.changeset/grumpy-bananas-brush.md b/.changeset/grumpy-bananas-brush.md
new file mode 100644
index 0000000000000..d0ce1dfe421d5
--- /dev/null
+++ b/.changeset/grumpy-bananas-brush.md
@@ -0,0 +1,5 @@
+---
+"@eth-optimism/data-transport-layer": patch
+---
+
+Remove legacy transaction deserialization to support RLP batch encoding
diff --git a/packages/data-transport-layer/src/services/l1-ingestion/handlers/sequencer-batch-appended.ts b/packages/data-transport-layer/src/services/l1-ingestion/handlers/sequencer-batch-appended.ts
index c185520562a73..f472372d476be 100644
--- a/packages/data-transport-layer/src/services/l1-ingestion/handlers/sequencer-batch-appended.ts
+++ b/packages/data-transport-layer/src/services/l1-ingestion/handlers/sequencer-batch-appended.ts
@@ -240,12 +240,7 @@ const maybeDecodeSequencerBatchTransaction = (
   decoded: DecodedSequencerBatchTransaction | null
   type: 'EIP155' | 'ETH_SIGN' | null
 } => {
-  let decoded = null
-  let type = null
-
   try {
-    // Try to decode as RLP first. This function will throw if the transaction can't be properly
-    // decoded as RLP and we'll get bumped down to the next set of possible decodings.
     const decodedTx = ethers.utils.parseTransaction(transaction)
 
     return {
@@ -265,31 +260,10 @@ const maybeDecodeSequencerBatchTransaction = (
       },
     }
   } catch (err) {
-    // Do nothing, fall back to legacy decode.
-  }
-
-  try {
-    const txType = transaction.slice(0, 1).readUInt8()
-    if (txType === TxType.EIP155) {
-      type = 'EIP155'
-      decoded = ctcCoder.eip155TxData.decode(transaction.toString('hex'))
-    } else if (txType === TxType.EthSign) {
-      type = 'ETH_SIGN'
-      decoded = ctcCoder.ethSignTxData.decode(transaction.toString('hex'))
-    } else {
-      throw new Error(`Unknown sequencer transaction type.`)
-    }
-    // Validate the transaction
-    if (!validateBatchTransaction(type, decoded)) {
-      decoded = null
+    return {
+      decoded: null,
+      type: null,
     }
-  } catch (err) {
-    // Do nothing
-  }
-
-  return {
-    decoded,
-    type,
   }
 }
 
diff --git a/packages/data-transport-layer/test/unit-tests/services/l1-ingestion/handlers/sequencer-batch-appended.spec.ts b/packages/data-transport-layer/test/unit-tests/services/l1-ingestion/handlers/sequencer-batch-appended.spec.ts
index 1cb6b36acfffb..edd91577070f4 100644
--- a/packages/data-transport-layer/test/unit-tests/services/l1-ingestion/handlers/sequencer-batch-appended.spec.ts
+++ b/packages/data-transport-layer/test/unit-tests/services/l1-ingestion/handlers/sequencer-batch-appended.spec.ts
@@ -136,65 +136,6 @@ describe('Event Handlers: OVM_CanonicalTransactionChain.SequencerBatchAppended',
         '10B99425FB53AD7D40A939205C0F7B35CBB89AB4D67E7AE64BDAC5F1073943B4',
       batchExtraData: '',
     }
-    it('should correctly parse a mainnet transaction', async () => {
-      const input1: [any, SequencerBatchAppendedExtraData] = [
-        {
-          args: {
-            _startingQueueIndex: ethers.constants.Zero,
-            _numQueueElements: ethers.constants.Zero,
-            _totalElements: ethers.constants.Zero,
-          },
-        },
-        {
-          l1TransactionData,
-          ...exampleExtraData,
-        },
-      ]
-
-      const output1 = await handleEventsSequencerBatchAppended.parseEvent(
-        ...input1
-      )
-
-      const batchEntry = output1.transactionBatchEntry
-      expect(batchEntry.index).to.eq(exampleExtraData.batchIndex.toNumber())
-      expect(batchEntry.root).to.eq(exampleExtraData.batchRoot)
-      expect(batchEntry.size).to.eq(exampleExtraData.batchSize.toNumber())
-      expect(batchEntry.prevTotalElements).to.eq(
-        exampleExtraData.prevTotalElements.toNumber()
-      )
-      expect(batchEntry.extraData).to.eq(exampleExtraData.batchExtraData)
-      expect(batchEntry.blockNumber).to.eq(exampleExtraData.blockNumber)
-      expect(batchEntry.timestamp).to.eq(exampleExtraData.timestamp)
-      expect(batchEntry.submitter).to.eq(exampleExtraData.submitter)
-      expect(batchEntry.l1TransactionHash).to.eq(
-        exampleExtraData.l1TransactionHash
-      )
-
-      // Expected transaction entry results based on mainnet data
-      // Source: https://ethtx.info/mainnet/0x6effe006836b841205ace4d99d7ae1b74ee96aac499a3f358b97fccd32ee9af2
-      const txEntries = output1.transactionEntries
-      expect(txEntries).to.have.length(101)
-      expect(txEntries.every((t) => t.queueOrigin === 'sequencer' || 'l1')).to
-        .be.true
-
-      // Sequencer transactions are decoded, but l1 transactions are not
-      txEntries.forEach((tx, i) => {
-        if (tx.queueOrigin === 'l1') {
-          expect(tx.decoded).to.be.null
-        } else {
-          const l2Tx = blocksOnL2[i].transactions[0]
-          expect(tx.decoded.data).to.equal(l2Tx.data)
-          expect(tx.decoded.target).to.equal(l2Tx.to.toLowerCase())
-          expect(tx.decoded.nonce).to.equal(l2Tx.nonce)
-          expect(tx.decoded.gasLimit).to.equal(
-            BigNumber.from(l2Tx.gasLimit.hex).toNumber()
-          )
-          expect(tx.decoded.gasPrice).to.equal(
-            BigNumber.from(l2Tx.gasPrice.hex).toNumber()
-          )
-        }
-      })
-    })
 
     it('should error on malformed transaction data', async () => {
       const input1: [any, SequencerBatchAppendedExtraData] = [