diff --git a/beacon/params/networks.go b/beacon/params/networks.go
index b35db34fd6..5dcf08cc5d 100644
--- a/beacon/params/networks.go
+++ b/beacon/params/networks.go
@@ -40,36 +40,39 @@ var (
 		GenesisTime:           1606824023,
 		Checkpoint:            common.HexToHash(checkpointMainnet),
 	}).
-		AddFork("GENESIS", 0, []byte{0, 0, 0, 0}).
-		AddFork("ALTAIR", 74240, []byte{1, 0, 0, 0}).
-		AddFork("BELLATRIX", 144896, []byte{2, 0, 0, 0}).
-		AddFork("CAPELLA", 194048, []byte{3, 0, 0, 0}).
-		AddFork("DENEB", 269568, []byte{4, 0, 0, 0}).
-		AddFork("ELECTRA", 364032, []byte{5, 0, 0, 0})
+		AddFork("GENESIS", 0, common.FromHex("0x00000000")).
+		AddFork("ALTAIR", 74240, common.FromHex("0x01000000")).
+		AddFork("BELLATRIX", 144896, common.FromHex("0x02000000")).
+		AddFork("CAPELLA", 194048, common.FromHex("0x03000000")).
+		AddFork("DENEB", 269568, common.FromHex("0x04000000")).
+		AddFork("ELECTRA", 364032, common.FromHex("0x05000000")).
+		AddFork("FULU", 411392, common.FromHex("0x06000000"))
 
 	SepoliaLightConfig = (&ChainConfig{
 		GenesisValidatorsRoot: common.HexToHash("0xd8ea171f3c94aea21ebc42a1ed61052acf3f9209c00e4efbaaddac09ed9b8078"),
 		GenesisTime:           1655733600,
 		Checkpoint:            common.HexToHash(checkpointSepolia),
 	}).
-		AddFork("GENESIS", 0, []byte{144, 0, 0, 105}).
-		AddFork("ALTAIR", 50, []byte{144, 0, 0, 112}).
-		AddFork("BELLATRIX", 100, []byte{144, 0, 0, 113}).
-		AddFork("CAPELLA", 56832, []byte{144, 0, 0, 114}).
-		AddFork("DENEB", 132608, []byte{144, 0, 0, 115}).
-		AddFork("ELECTRA", 222464, []byte{144, 0, 0, 116})
+		AddFork("GENESIS", 0, common.FromHex("0x90000069")).
+		AddFork("ALTAIR", 50, common.FromHex("0x90000070")).
+		AddFork("BELLATRIX", 100, common.FromHex("0x90000071")).
+		AddFork("CAPELLA", 56832, common.FromHex("0x90000072")).
+		AddFork("DENEB", 132608, common.FromHex("0x90000073")).
+		AddFork("ELECTRA", 222464, common.FromHex("0x90000074")).
+		AddFork("FULU", 272640, common.FromHex("0x90000075"))
 
 	HoleskyLightConfig = (&ChainConfig{
 		GenesisValidatorsRoot: common.HexToHash("0x9143aa7c615a7f7115e2b6aac319c03529df8242ae705fba9df39b79c59fa8b1"),
 		GenesisTime:           1695902400,
 		Checkpoint:            common.HexToHash(checkpointHolesky),
 	}).
-		AddFork("GENESIS", 0, []byte{1, 1, 112, 0}).
-		AddFork("ALTAIR", 0, []byte{2, 1, 112, 0}).
-		AddFork("BELLATRIX", 0, []byte{3, 1, 112, 0}).
-		AddFork("CAPELLA", 256, []byte{4, 1, 112, 0}).
-		AddFork("DENEB", 29696, []byte{5, 1, 112, 0}).
-		AddFork("ELECTRA", 115968, []byte{6, 1, 112, 0})
+		AddFork("GENESIS", 0, common.FromHex("0x01017000")).
+		AddFork("ALTAIR", 0, common.FromHex("0x02017000")).
+		AddFork("BELLATRIX", 0, common.FromHex("0x03017000")).
+		AddFork("CAPELLA", 256, common.FromHex("0x04017000")).
+		AddFork("DENEB", 29696, common.FromHex("0x05017000")).
+		AddFork("ELECTRA", 115968, common.FromHex("0x06017000")).
+		AddFork("FULU", 165120, common.FromHex("0x07017000"))
 
 	HoodiLightConfig = (&ChainConfig{
 		GenesisValidatorsRoot: common.HexToHash("0x212f13fc4df078b6cb7db228f1c8307566dcecf900867401a92023d7ba99cb5f"),
@@ -82,5 +85,5 @@ var (
 		AddFork("CAPELLA", 0, common.FromHex("0x40000910")).
 		AddFork("DENEB", 0, common.FromHex("0x50000910")).
 		AddFork("ELECTRA", 2048, common.FromHex("0x60000910")).
-		AddFork("FULU", 18446744073709551615, common.FromHex("0x70000910"))
+		AddFork("FULU", 50688, common.FromHex("0x70000910"))
 )