diff --git a/packages/constants/src/lib/constants/constants.ts b/packages/constants/src/lib/constants/constants.ts
index 2406640a5..6b59a258a 100644
--- a/packages/constants/src/lib/constants/constants.ts
+++ b/packages/constants/src/lib/constants/constants.ts
@@ -1121,6 +1121,61 @@ export const LIT_CHAINS: LITChain<LITEVMChain> = {
     type: null,
     vmType: 'EVM',
   },
+  sonicMainnet: {
+    contractAddress: null,
+    chainId: 146,
+    name: 'Sonic Mainnet',
+    symbol: 'S',
+    decimals: 18,
+    rpcUrls: ['https://rpc.soniclabs.com'],
+    blockExplorerUrls: ['https://sonicscan.org'],
+    type: null,
+    vmType: 'EVM',
+  },
+  sonicBlazeTestnet: {
+    contractAddress: null,
+    chainId: 57054,
+    name: 'Sonic Blaze Testnet',
+    symbol: 'S',
+    decimals: 18,
+    rpcUrls: ['https://rpc.blaze.soniclabs.com'],
+    blockExplorerUrls: ['https://testnet.sonicscan.org/'],
+    type: null,
+    vmType: 'EVM',
+  },
+  holeskyTestnet: {
+    contractAddress: null,
+    chainId: 17000,
+    name: 'Holesky Testnet',
+    symbol: 'ETH',
+    decimals: 18,
+    rpcUrls: ['https://rpc.holesky.ethpandaops.io'],
+    blockExplorerUrls: ['https://holesky.etherscan.io/'],
+    type: null,
+    vmType: 'EVM',
+  },
+  flowEvmMainnet: {
+    contractAddress: null,
+    chainId: 747,
+    name: 'Flow EVM Mainnet',
+    symbol: 'FLOW',
+    decimals: 18,
+    rpcUrls: ['https://mainnet.evm.nodes.onflow.org'],
+    blockExplorerUrls: ['https://evm.flowscan.io/'],
+    type: null,
+    vmType: 'EVM',
+  },
+  flowEvmTestnet: {
+    contractAddress: null,
+    chainId: 545,
+    name: 'Flow EVM Testnet',
+    symbol: 'FLOW',
+    decimals: 18,
+    rpcUrls: ['https://testnet.evm.nodes.onflow.org'],
+    blockExplorerUrls: ['https://evm-testnet.flowscan.io'],
+    type: null,
+    vmType: 'EVM',
+  },
 };
 
 /**