diff --git a/core/chains/evm/config/toml/defaults/zkSync_Sepolia.toml b/core/chains/evm/config/toml/defaults/zkSync_Sepolia.toml
new file mode 100644
index 00000000000..0801e54acc9
--- /dev/null
+++ b/core/chains/evm/config/toml/defaults/zkSync_Sepolia.toml
@@ -0,0 +1,14 @@
+ChainID = '300'
+ChainType = 'zksync'
+FinalityDepth = 1
+LogPollInterval = '5s'
+MinIncomingConfirmations = 1
+NoNewHeadsThreshold = '1m'
+
+[GasEstimator]
+LimitDefault = 100_000_000
+PriceMax = 18446744073709551615
+PriceMin = 0
+
+[HeadTracker]
+HistoryDepth = 5
diff --git a/docs/CONFIG.md b/docs/CONFIG.md
index 97e356e7959..c91f7d0e23c 100644
--- a/docs/CONFIG.md
+++ b/docs/CONFIG.md
@@ -3105,6 +3105,90 @@ GasLimit = 5400000
 
 </p></details>
 
+<details><summary>zkSync Sepolia (300)</summary><p>
+
+```toml
+AutoCreateKey = true
+BlockBackfillDepth = 10
+BlockBackfillSkip = false
+ChainType = 'zksync'
+FinalityDepth = 1
+FinalityTagEnabled = false
+LogBackfillBatchSize = 1000
+LogPollInterval = '5s'
+LogKeepBlocksDepth = 100000
+LogPrunePageSize = 0
+BackupLogPollerBlockDelay = 100
+MinIncomingConfirmations = 1
+MinContractPayment = '0.00001 link'
+NonceAutoSync = true
+NoNewHeadsThreshold = '1m0s'
+RPCDefaultBatchSize = 250
+RPCBlockQueryDelay = 1
+
+[Transactions]
+ForwardersEnabled = false
+MaxInFlight = 16
+MaxQueued = 250
+ReaperInterval = '1h0m0s'
+ReaperThreshold = '168h0m0s'
+ResendAfterThreshold = '1m0s'
+
+[BalanceMonitor]
+Enabled = true
+
+[GasEstimator]
+Mode = 'BlockHistory'
+PriceDefault = '20 gwei'
+PriceMax = '18.446744073709551615 ether'
+PriceMin = '0'
+LimitDefault = 100000000
+LimitMax = 500000
+LimitMultiplier = '1'
+LimitTransfer = 21000
+BumpMin = '5 gwei'
+BumpPercent = 20
+BumpThreshold = 3
+EIP1559DynamicFees = false
+FeeCapDefault = '100 gwei'
+TipCapDefault = '1 wei'
+TipCapMin = '1 wei'
+
+[GasEstimator.BlockHistory]
+BatchSize = 25
+BlockHistorySize = 8
+CheckInclusionBlocks = 12
+CheckInclusionPercentile = 90
+TransactionPercentile = 60
+
+[HeadTracker]
+HistoryDepth = 5
+MaxBufferSize = 3
+SamplingInterval = '1s'
+
+[NodePool]
+PollFailureThreshold = 5
+PollInterval = '10s'
+SelectionMode = 'HighestHead'
+SyncThreshold = 5
+LeaseDuration = '0s'
+NodeIsSyncingEnabled = false
+
+[OCR]
+ContractConfirmations = 4
+ContractTransmitterTransmitTimeout = '10s'
+DatabaseTimeout = '10s'
+DeltaCOverride = '168h0m0s'
+DeltaCJitterOverride = '1h0m0s'
+ObservationGracePeriod = '1s'
+
+[OCR2]
+[OCR2.Automation]
+GasLimit = 5400000
+```
+
+</p></details>
+
 <details><summary>zkSync Mainnet (324)</summary><p>
 
 ```toml