diff --git a/CHAINS.md b/CHAINS.md
index 3385e37a0..6a02ab3f6 100755
--- a/CHAINS.md
+++ b/CHAINS.md
@@ -71,6 +71,11 @@
 | Chain Name | OP Governed[^1] | Superchain Hardforks[^2] | Explorer | Public RPC | Sequencer RPC
 |---|---|---|---|---|---|
 | OP Labs Sepolia devnet 0 | ✅ | ✅ |  | `` | `` |
+### sepolia-dev-1
+
+| Chain Name | OP Governed[^1] | Superchain Hardforks[^2] | Explorer | Public RPC | Sequencer RPC
+|---|---|---|---|---|---|
+| sepolia-dev-1 | ✅ | ✅ |  | `https://sepolia-dev-1.optimism.io` | `` |
 
 
 [^1]: Chains are governed by Optimism if their `L1ProxyAdminOwner` is set to the value specified by the standard config and [configurability.md](https://github.com/ethereum-optimism/specs/blob/main/specs/protocol/configurability.md#l1-proxyadmin-owner).
diff --git a/chainList.json b/chainList.json
index 34835a0a8..afdd9ec71 100755
--- a/chainList.json
+++ b/chainList.json
@@ -1160,5 +1160,26 @@
     "faultProofs": {
       "status": "permissioned"
     }
+  },
+  {
+    "name": "sepolia-dev-1",
+    "identifier": "sepolia-dev-1/sepolia-dev-1",
+    "chainId": 420130014,
+    "rpc": [
+      "https://sepolia-dev-1.optimism.io"
+    ],
+    "explorers": [
+      ""
+    ],
+    "superchainLevel": 0,
+    "governedByOptimism": true,
+    "dataAvailabilityType": "eth-da",
+    "parent": {
+      "type": "L2",
+      "chain": "sepolia-dev-1"
+    },
+    "faultProofs": {
+      "status": "permissioned"
+    }
   }
 ]
\ No newline at end of file
diff --git a/chainList.toml b/chainList.toml
index b2be90374..b29b02604 100755
--- a/chainList.toml
+++ b/chainList.toml
@@ -829,3 +829,18 @@
     chain = "sepolia"
   [chains.fault_proofs]
     status = "permissioned"
+
+[[chains]]
+  name = "sepolia-dev-1"
+  identifier = "sepolia-dev-1/sepolia-dev-1"
+  chain_id = 420130014
+  rpc = ["https://sepolia-dev-1.optimism.io"]
+  explorers = [""]
+  superchain_level = 0
+  governed_by_optimism = true
+  data_availability_type = "eth-da"
+  [chains.parent]
+    type = "L2"
+    chain = "sepolia-dev-1"
+  [chains.fault_proofs]
+    status = "permissioned"
diff --git a/superchain/configs/sepolia-dev-1/sepolia-dev-1.toml b/superchain/configs/sepolia-dev-1/sepolia-dev-1.toml
new file mode 100755
index 000000000..737e885d2
--- /dev/null
+++ b/superchain/configs/sepolia-dev-1/sepolia-dev-1.toml
@@ -0,0 +1,52 @@
+name = "sepolia-dev-1"
+public_rpc = "https://sepolia-dev-1.optimism.io"
+sequencer_rpc = ""
+explorer = ""
+superchain_level = 0
+governed_by_optimism = true
+superchain_time = 0
+data_availability_type = "eth-da"
+chain_id = 420130014
+batch_inbox_addr = "0x006e998898E332a7eA117c6695F906BFf469b437"
+block_time = 1
+seq_window_size = 3600
+max_sequencer_drift = 600
+
+[hardforks]
+  canyon_time = 0 # Thu 1 Jan 1970 00:00:00 UTC
+  delta_time = 0 # Thu 1 Jan 1970 00:00:00 UTC
+  ecotone_time = 0 # Thu 1 Jan 1970 00:00:00 UTC
+  fjord_time = 0 # Thu 1 Jan 1970 00:00:00 UTC
+  granite_time = 0 # Thu 1 Jan 1970 00:00:00 UTC
+  holocene_time = 0 # Thu 1 Jan 1970 00:00:00 UTC
+  isthmus_time = 0 # Thu 1 Jan 1970 00:00:00 UTC
+  jovian_time = 0 # Thu 1 Jan 1970 00:00:00 UTC
+  karst_time = 0 # Thu 1 Jan 1970 00:00:00 UTC
+
+[optimism]
+  eip1559_elasticity = 6
+  eip1559_denominator = 50
+  eip1559_denominator_canyon = 250
+
+[genesis]
+  l2_time = 1782412416
+  [genesis.l1]
+    hash = "0x830cf2867e45bbef19d5f8388a872baaab8593340571a7c5b7f3fd50771d5323"
+    number = 11138539
+  [genesis.l2]
+    hash = "0x209a02bc759336e0cadb292a284c65276db1b59477b97f2ff174acc1e95ce329"
+    number = 0
+  [genesis.system_config]
+    batcherAddress = "0x459Ef71Eb836753C732DF6a1F13A823Ab6ba4DfE"
+    overhead = "0x0000000000000000000000000000000000000000000000000000000000000000"
+    scalar = "0x010000000000000000000000000000000000000000000000000c3c9d00000558"
+    gasLimit = 60000000
+
+[roles]
+  ProxyAdminOwner = "0xe934Dc97E347C6aCef74364B50125bb8689c40ff"
+
+[addresses]
+  L1StandardBridgeProxy = "0xb7A9F4324F2D5345f705A167754bD65ce23F8c38"
+  OptimismPortalProxy = "0xed2fdc29aEFc86093506bE335A5A77A1D6b09C35"
+  SystemConfigProxy = "0xadd4d13bC4115DEb19b53C8717Fc8CF0d24999e5"
+  DisputeGameFactoryProxy = "0x880CbC3ad85e35D2193b7656dD08eB93F3421a54"
diff --git a/superchain/configs/sepolia-dev-1/superchain.toml b/superchain/configs/sepolia-dev-1/superchain.toml
new file mode 100755
index 000000000..8a1d022ba
--- /dev/null
+++ b/superchain/configs/sepolia-dev-1/superchain.toml
@@ -0,0 +1,11 @@
+name = "sepolia-dev-1"
+protocol_versions_addr = "0x478522cc306dF87e3E5b05e6F537065b4be18389"
+superchain_config_addr = "0x86806B8251D3d2007A38d647Ed80651b929F7DD6"
+op_contracts_manager_addr = "0x80DCEC9d21ce25B895ED26CA4AC8FEb88C159EeC"
+
+[hardforks]
+
+[l1]
+  chain_id = 11155111
+  public_rpc = "https://ethereum-sepolia-rpc.publicnode.com"
+  explorer = ""
diff --git a/superchain/extra/addresses/addresses.json b/superchain/extra/addresses/addresses.json
index dcc2e91b5..05f9cc2bb 100755
--- a/superchain/extra/addresses/addresses.json
+++ b/superchain/extra/addresses/addresses.json
@@ -694,6 +694,30 @@
     "SystemConfigProxy": "0x08712404111E4b5B4504e67BEF33205608791Ef7",
     "UnsafeBlockSigner": "0x2229CfE26a83225fa80DBf6564E6DaCe44e1057c"
   },
+  "420130014": {
+    "AddressManager": "0x32b1f5436Afe1B43BAb4e6ebC0309E6BAff5F2e4",
+    "AnchorStateRegistryProxy": "0xF3E9066D2710864DF9A708AB2F8d2aa7a22D868F",
+    "BatchSubmitter": "0x459Ef71Eb836753C732DF6a1F13A823Ab6ba4DfE",
+    "Challenger": "0xdA87A5AB9df13f0572c12D2a2a99fDf73de2c344",
+    "DelayedWETHProxy": "0x35A73E5fbc36c50DAD9D68A308eA1f02Faa46d78",
+    "DisputeGameFactoryProxy": "0x880CbC3ad85e35D2193b7656dD08eB93F3421a54",
+    "Guardian": "0xe934Dc97E347C6aCef74364B50125bb8689c40ff",
+    "L1CrossDomainMessengerProxy": "0x8384Aba6C6912566A8F8D1b62a18Ba87Fc57C2E5",
+    "L1ERC721BridgeProxy": "0xc636347aFF21aBE7fb0DF43816cDAb11FC9C232e",
+    "L1StandardBridgeProxy": "0xb7A9F4324F2D5345f705A167754bD65ce23F8c38",
+    "MIPS": "0xaCc005DCd857B401e4732E6F7837135A22825cfA",
+    "OptimismMintableERC20FactoryProxy": "0x8aa40DFeB719389608471899e2B2ba0FC3af93Fc",
+    "OptimismPortalProxy": "0xed2fdc29aEFc86093506bE335A5A77A1D6b09C35",
+    "PermissionedDisputeGame": "0xe1dFFCBE4e22B813F26d2106D943C102e7cAb87e",
+    "PreimageOracle": "0x1E1d73536A081Ef2F355d29794547a9770Aeb1E0",
+    "Proposer": "0xE1Ca7DC17E85183434A3E6e9F525d8d856fd4305",
+    "ProxyAdmin": "0x1d71BD9f39B1b3786dBeBB212e335f32499EaB28",
+    "ProxyAdminOwner": "0xe934Dc97E347C6aCef74364B50125bb8689c40ff",
+    "SuperchainConfig": "0x86806B8251D3d2007A38d647Ed80651b929F7DD6",
+    "SystemConfigOwner": "0x08Da32fe962570a088f6A7712b42f76907F6B5A6",
+    "SystemConfigProxy": "0xadd4d13bC4115DEb19b53C8717Fc8CF0d24999e5",
+    "UnsafeBlockSigner": "0x284dCdfF9c92508ec1bD137060cdCfCCC26839a1"
+  },
   "4202": {
     "AddressManager": "0x27Bb4A7cd8FB20cb816BF4Aac668BF841bb3D5d3",
     "BatchSubmitter": "0x246E119a5BcC2875161b23E4e602e25cEcE96E37",
diff --git a/superchain/extra/genesis/sepolia-dev-1/sepolia-dev-1.json.zst b/superchain/extra/genesis/sepolia-dev-1/sepolia-dev-1.json.zst
new file mode 100755
index 000000000..25fc23a20
Binary files /dev/null and b/superchain/extra/genesis/sepolia-dev-1/sepolia-dev-1.json.zst differ