diff --git a/params/config.go b/params/config.go
index 345f6394ab..4a83ceb1bd 100644
--- a/params/config.go
+++ b/params/config.go
@@ -31,7 +31,7 @@ var (
 var (
 	// MainnetChainConfig is the chain parameters to run a node on the main network.
 	MainnetChainConfig = &ChainConfig{
-		ChainId:        big.NewInt(1),
+		ChainId:        big.NewInt(101),
 		HomesteadBlock: big.NewInt(1150000),
 		DAOForkBlock:   big.NewInt(1920000),
 		DAOForkSupport: true,
@@ -46,7 +46,7 @@ var (
 
 	// TestnetChainConfig contains the chain parameters to run a node on the Ropsten test network.
 	TestnetChainConfig = &ChainConfig{
-		ChainId:        big.NewInt(3),
+		ChainId:        big.NewInt(103),
 		HomesteadBlock: big.NewInt(0),
 		DAOForkBlock:   nil,
 		DAOForkSupport: true,
@@ -61,7 +61,7 @@ var (
 
 	// RinkebyChainConfig contains the chain parameters to run a node on the Rinkeby test network.
 	RinkebyChainConfig = &ChainConfig{
-		ChainId:        big.NewInt(4),
+		ChainId:        big.NewInt(104),
 		HomesteadBlock: big.NewInt(1),
 		DAOForkBlock:   nil,
 		DAOForkSupport: true,