diff --git a/cli/main.go b/cli/main.go
index 4150dc89..1448569b 100644
--- a/cli/main.go
+++ b/cli/main.go
@@ -58,7 +58,7 @@ var (
 	relayTimeoutMsRegVal     = flag.Int("request-timeout-regval", defaultTimeoutMsRegisterValidator, "timeout for registerValidator requests [ms]")
 
 	// helpers
-	useGenesisForkVersionMainnet = flag.Bool("mainnet", false, "use Mainnet")
+	useGenesisForkVersionMainnet = flag.Bool("mainnet", true, "use Mainnet")
 	useGenesisForkVersionSepolia = flag.Bool("sepolia", false, "use Sepolia")
 	useGenesisForkVersionGoerli  = flag.Bool("goerli", false, "use Goerli")
 	useCustomGenesisForkVersion  = flag.String("genesis-fork-version", defaultGenesisForkVersion, "use a custom genesis fork version")