diff --git a/bold b/bold
index ef565260c2..5b6d0841b1 160000
--- a/bold
+++ b/bold
@@ -1 +1 @@
-Subproject commit ef565260c242933eb13b28219e6f55342b07dbe1
+Subproject commit 5b6d0841b19ee93d19946c660bcf35cab9cc254c
diff --git a/staker/challenge_test.go b/staker/challenge_test.go
index c21ebcdecd..f5b7ac034e 100644
--- a/staker/challenge_test.go
+++ b/staker/challenge_test.go
@@ -23,6 +23,7 @@ import (
 	"github.com/offchainlabs/nitro/solgen/go/ospgen"
 	"github.com/offchainlabs/nitro/validator"
 	"github.com/offchainlabs/nitro/validator/server_arb"
+	"github.com/offchainlabs/nitro/validator/server_common"
 )
 
 func DeployOneStepProofEntry(t *testing.T, auth *bind.TransactOpts, client bind.ContractBackend) common.Address {
@@ -159,7 +160,9 @@ func runChallengeTest(
 	backend.Commit()
 
 	asserterRun, err := server_arb.NewExecutionRun(ctx,
-		func(context.Context) (server_arb.MachineInterface, error) { return asserterMachine, nil },
+		func(context.Context, ...server_common.MachineLoaderOpt) (server_arb.MachineInterface, error) {
+			return asserterMachine, nil
+		},
 		&server_arb.DefaultMachineCacheConfig)
 	Require(t, err)
 
@@ -175,7 +178,9 @@ func runChallengeTest(
 	Require(t, err)
 
 	challengerRun, err := server_arb.NewExecutionRun(ctx,
-		func(context.Context) (server_arb.MachineInterface, error) { return challengerMachine, nil },
+		func(context.Context, ...server_common.MachineLoaderOpt) (server_arb.MachineInterface, error) {
+			return challengerMachine, nil
+		},
 		&server_arb.DefaultMachineCacheConfig)
 	Require(t, err)
 	challengerManager, err := NewExecutionChallengeManager(