diff --git a/go.mod b/go.mod
index 4984d83..2feb416 100644
--- a/go.mod
+++ b/go.mod
@@ -35,6 +35,7 @@ require (
 	github.com/luxfi/cache v1.2.1 // indirect
 	github.com/luxfi/codec v1.1.4 // indirect
 	github.com/luxfi/geth v1.16.98 // indirect
+	github.com/luxfi/light v1.0.0
 	github.com/luxfi/math/big v0.1.0 // indirect
 	github.com/luxfi/metric v1.5.5 // indirect
 	github.com/luxfi/mock v0.1.1 // indirect
diff --git a/go.sum b/go.sum
index efee05d..8d77dfb 100644
--- a/go.sum
+++ b/go.sum
@@ -215,3 +215,5 @@ gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+github.com/luxfi/light v1.0.0 h1:zTJgp5M0xX8rIwRjYDQgOGhLas3rgXyhkszrTX+ne3s=
+github.com/luxfi/light v1.0.0/go.mod h1:1G0kgjEe/srlBMCIrFq4IvhnrMuHKFG18CRUWfw1z30=
diff --git a/pkg/genesis/keys.go b/pkg/genesis/keys.go
index 837f1f9..a60b6b5 100644
--- a/pkg/genesis/keys.go
+++ b/pkg/genesis/keys.go
@@ -28,6 +28,7 @@ import (
 	"github.com/luxfi/go-bip32"
 	"github.com/luxfi/go-bip39"
 	"github.com/luxfi/ids"
+	"github.com/luxfi/light"
 	"github.com/luxfi/log"
 	luxtls "github.com/luxfi/tls"
 	"golang.org/x/crypto/sha3"
@@ -74,7 +75,11 @@ const (
 	// value of LUX_MNEMONIC to bootstrap a local network (network ID >=
 	// 1337). RefuseLightMnemonicOnProduction enforces it cannot be used
 	// on mainnet/testnet/devnet (network IDs 1/2/3).
-	LightMnemonic = "light light light light light light light light light light light energy"
+	//
+	// Single source of truth: github.com/luxfi/light.Mnemonic. This is a
+	// backward-compat re-export so existing genesis.LightMnemonic callers
+	// keep working; do not re-declare the literal here.
+	LightMnemonic = light.Mnemonic
 )
 
 // KeyInfo contains parsed key information for a node
@@ -574,7 +579,6 @@ func privateKeyToEVMAddress(privKey []byte) (ids.ShortID, error) {
 	return addr, nil
 }
 
-
 // keccakBytes returns Keccak256(data) as a []byte slice (saves the
 // two-step assignment-then-slice that Go requires for function-returned
 // arrays).
@@ -1123,4 +1127,3 @@ func buildConfigFromKeyInfos(networkID uint32, validatorKeys []KeyInfo, allKeys
 		Message:                    genesisMessage(networkID),
 	}, nil
 }
-