diff --git a/benchmark/EstimateMaxCount.t.sol b/benchmark/EstimateMaxCount.t.sol
index 792f8ad80..ac8d110ec 100644
--- a/benchmark/EstimateMaxCount.t.sol
+++ b/benchmark/EstimateMaxCount.t.sol
@@ -27,7 +27,7 @@ contract EstimateMaxCount is Test {
         chains.push(ChainInfo({ blockGasLimit: 32_000_000, chainId: 42_161 })); // Arbitrum
         chains.push(ChainInfo({ blockGasLimit: 15_000_000, chainId: 43_114 })); // Avalanche
         chains.push(ChainInfo({ blockGasLimit: 60_000_000, chainId: 8453 })); // Base
-        chains.push(ChainInfo({ blockGasLimit: 30_000_000, chainId: 238 })); // Blast
+        chains.push(ChainInfo({ blockGasLimit: 30_000_000, chainId: 81_457 })); // Blast
         chains.push(ChainInfo({ blockGasLimit: 138_000_000, chainId: 56 })); // BNB
         chains.push(ChainInfo({ blockGasLimit: 30_000_000, chainId: 1 })); // Ethereum
         chains.push(ChainInfo({ blockGasLimit: 17_000_000, chainId: 100 })); // Gnosis
diff --git a/script/Base.s.sol b/script/Base.s.sol
index 35cb9c755..7fbf27703 100644
--- a/script/Base.s.sol
+++ b/script/Base.s.sol
@@ -99,8 +99,8 @@ contract BaseScript is Script {
         trancheCountMap[8453] = 2270;
 
         // Blast chain ID.
-        segmentCountMap[238] = 1080;
-        trancheCountMap[238] = 1120;
+        segmentCountMap[81457] = 1080;
+        trancheCountMap[81457] = 1120;
 
         // BNB chain ID.
         segmentCountMap[56] = 4820;