diff --git a/contracts b/contracts
index 7c46876077..1cab72ff3d 160000
--- a/contracts
+++ b/contracts
@@ -1 +1 @@
-Subproject commit 7c46876077c6353c7ebdf9cd364710d357fa3914
+Subproject commit 1cab72ff3dfcfe06ceed371a9db7a54a527e3bfb
diff --git a/go-ethereum b/go-ethereum
index 09ec05c142..8f491a030a 160000
--- a/go-ethereum
+++ b/go-ethereum
@@ -1 +1 @@
-Subproject commit 09ec05c142b0430fa7b0d270f80ef423f1bb8a93
+Subproject commit 8f491a030ac7a5bac886a050037d7a893ccff865
diff --git a/system_tests/pendingblock_test.go b/system_tests/pendingblock_test.go
new file mode 100644
index 0000000000..dc21bca525
--- /dev/null
+++ b/system_tests/pendingblock_test.go
@@ -0,0 +1,53 @@
+// Copyright 2021-2022, Offchain Labs, Inc.
+// For license information, see https://github.com/nitro/blob/master/LICENSE
+
+package arbtest
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/offchainlabs/nitro/solgen/go/mocksgen"
+)
+
+func TestPendingBlockTimeAndNumberAdvance(t *testing.T) {
+	t.Parallel()
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	builder := NewNodeBuilder(ctx).DefaultConfig(t, true)
+	cleanup := builder.Build(t)
+	defer cleanup()
+
+	auth := builder.L2Info.GetDefaultTransactOpts("Faucet", ctx)
+
+	_, _, testTimeAndNr, err := mocksgen.DeployPendingBlkTimeAndNrAdvanceCheck(&auth, builder.L2.Client)
+	Require(t, err)
+
+	time.Sleep(1 * time.Second)
+
+	_, err = testTimeAndNr.IsAdvancing(&auth)
+	Require(t, err)
+}
+
+func TestPendingBlockArbBlockHashReturnsLatest(t *testing.T) {
+	t.Parallel()
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	builder := NewNodeBuilder(ctx).DefaultConfig(t, true)
+	cleanup := builder.Build(t)
+	defer cleanup()
+
+	auth := builder.L2Info.GetDefaultTransactOpts("Faucet", ctx)
+
+	_, _, pendingBlk, err := mocksgen.DeployPendingBlkTimeAndNrAdvanceCheck(&auth, builder.L2.Client)
+	Require(t, err)
+
+	header, err := builder.L2.Client.HeaderByNumber(ctx, nil)
+	Require(t, err)
+
+	_, err = pendingBlk.CheckArbBlockHashReturnsLatest(&auth, header.Hash())
+	Require(t, err)
+}
diff --git a/system_tests/rpc_test.go b/system_tests/rpc_test.go
index 357cb8e4c1..511a608e67 100644
--- a/system_tests/rpc_test.go
+++ b/system_tests/rpc_test.go
@@ -7,10 +7,8 @@ import (
 	"context"
 	"path/filepath"
 	"testing"
-	"time"
 
 	"github.com/ethereum/go-ethereum/ethclient"
-	"github.com/offchainlabs/nitro/solgen/go/mocksgen"
 )
 
 func TestIpcRpc(t *testing.T) {
@@ -27,23 +25,3 @@ func TestIpcRpc(t *testing.T) {
 	_, err := ethclient.Dial(ipcPath)
 	Require(t, err)
 }
-
-func TestPendingBlockTimeAndNumberAdvance(t *testing.T) {
-	t.Parallel()
-	ctx, cancel := context.WithCancel(context.Background())
-	defer cancel()
-
-	builder := NewNodeBuilder(ctx).DefaultConfig(t, true)
-	cleanup := builder.Build(t)
-	defer cleanup()
-
-	auth := builder.L2Info.GetDefaultTransactOpts("Faucet", ctx)
-
-	_, _, testTimeAndNr, err := mocksgen.DeployPendingBlkTimeAndNrAdvanceCheck(&auth, builder.L2.Client)
-	Require(t, err)
-
-	time.Sleep(1 * time.Second)
-
-	_, err = testTimeAndNr.IsAdvancing(&auth)
-	Require(t, err)
-}