diff --git a/extern/filecoin-ffi b/extern/filecoin-ffi
index 28e3cd44d9..cec06f7f9d 160000
--- a/extern/filecoin-ffi
+++ b/extern/filecoin-ffi
@@ -1 +1 @@
-Subproject commit 28e3cd44d91681c074aba362d1e5c954db110ad9
+Subproject commit cec06f7f9d4c8ffd38caf4f7ac97381b453575ef
diff --git a/pkg/fork/fork.go b/pkg/fork/fork.go
index 7071f5b2aa..fa4b635d7e 100644
--- a/pkg/fork/fork.go
+++ b/pkg/fork/fork.go
@@ -34,6 +34,7 @@ import (
 	"go.opencensus.io/trace"
 
 	nv18 "github.com/filecoin-project/go-state-types/builtin/v10/migration"
+	nv19 "github.com/filecoin-project/go-state-types/builtin/v11/migration"
 	nv17 "github.com/filecoin-project/go-state-types/builtin/v9/migration"
 	"github.com/filecoin-project/go-state-types/migration"
 	"github.com/filecoin-project/specs-actors/actors/migration/nv3"
@@ -2407,14 +2408,14 @@ func (c *ChainFork) upgradeActorsV10Common(
 
 	if stateRoot.Version != vmstate.StateTreeVersion4 {
 		return cid.Undef, fmt.Errorf(
-			"expected state root version 4 for actors v9 upgrade, got %d",
+			"expected state root version 4 for actors v10 upgrade, got %d",
 			stateRoot.Version,
 		)
 	}
 
 	manifest, ok := actors.GetManifest(actorstypes.Version10)
 	if !ok {
-		return cid.Undef, fmt.Errorf("no manifest CID for v9 upgrade")
+		return cid.Undef, fmt.Errorf("no manifest CID for v10 upgrade")
 	}
 
 	// Perform the migration
@@ -2448,6 +2449,112 @@ func (c *ChainFork) upgradeActorsV10Common(
 	return newRoot, nil
 }
 
+func (c *ChainFork) PreUpgradeActorsV11(ctx context.Context, cache MigrationCache, root cid.Cid, epoch abi.ChainEpoch, ts *types.TipSet) error {
+	// Use half the CPUs for pre-migration, but leave at least 3.
+	workerCount := MigrationMaxWorkerCount
+	if workerCount <= 4 {
+		workerCount = 1
+	} else {
+		workerCount /= 2
+	}
+
+	nv := c.GetNetworkVersion(ctx, epoch)
+	lbts, lbRoot, err := c.cr.GetLookbackTipSetForRound(ctx, ts, epoch, nv)
+	if err != nil {
+		return fmt.Errorf("error getting lookback ts for premigration: %w", err)
+	}
+
+	config := migration.Config{
+		MaxWorkers:        uint(workerCount),
+		ProgressLogPeriod: time.Minute * 5,
+	}
+
+	_, err = c.upgradeActorsV11Common(ctx, cache, lbRoot, epoch, lbts, config)
+	return err
+}
+
+func (c *ChainFork) UpgradeActorsV11(ctx context.Context, cache MigrationCache,
+	root cid.Cid, epoch abi.ChainEpoch, ts *types.TipSet) (cid.Cid, error) {
+	// Use all the CPUs except 2.
+	workerCount := MigrationMaxWorkerCount - 3
+	if workerCount <= 0 {
+		workerCount = 1
+	}
+	config := migration.Config{
+		MaxWorkers:        uint(workerCount),
+		JobQueueSize:      1000,
+		ResultQueueSize:   100,
+		ProgressLogPeriod: 10 * time.Second,
+	}
+	newRoot, err := c.upgradeActorsV11Common(ctx, cache, root, epoch, ts, config)
+	if err != nil {
+		return cid.Undef, fmt.Errorf("migrating actors v11 state: %w", err)
+	}
+	return newRoot, nil
+}
+
+func (c *ChainFork) upgradeActorsV11Common(
+	ctx context.Context, cache MigrationCache,
+	root cid.Cid, epoch abi.ChainEpoch, ts *types.TipSet,
+	config migration.Config,
+) (cid.Cid, error) {
+	buf := blockstoreutil.NewTieredBstore(c.bs, blockstoreutil.NewTemporarySync())
+	store := adt.WrapStore(ctx, cbor.NewCborStore(buf))
+
+	// ensure that the manifest is loaded in the blockstore
+	if err := actors.LoadBundles(ctx, c.bs, actorstypes.Version11); err != nil {
+		return cid.Undef, fmt.Errorf("failed to load manifest bundle: %w", err)
+	}
+
+	// Load the state root.
+	var stateRoot vmstate.StateRoot
+	if err := store.Get(ctx, root, &stateRoot); err != nil {
+		return cid.Undef, fmt.Errorf("failed to decode state root: %w", err)
+	}
+
+	if stateRoot.Version != vmstate.StateTreeVersion5 {
+		return cid.Undef, fmt.Errorf(
+			"expected state root version 5 for actors v11 upgrade, got %d",
+			stateRoot.Version,
+		)
+	}
+
+	manifest, ok := actors.GetManifest(actorstypes.Version11)
+	if !ok {
+		return cid.Undef, fmt.Errorf("no manifest CID for v11 upgrade")
+	}
+
+	// Perform the migration
+	newHamtRoot, err := nv19.MigrateStateTree(ctx, store, manifest, stateRoot.Actors, epoch, config,
+		migrationLogger{}, cache)
+	if err != nil {
+		return cid.Undef, fmt.Errorf("upgrading to actors v11: %w", err)
+	}
+
+	// Persist the result.
+	newRoot, err := store.Put(ctx, &vmstate.StateRoot{
+		Version: vmstate.StateTreeVersion5,
+		Actors:  newHamtRoot,
+		Info:    stateRoot.Info,
+	})
+	if err != nil {
+		return cid.Undef, fmt.Errorf("failed to persist new state root: %w", err)
+	}
+
+	// Persist the new tree.
+
+	{
+		from := buf
+		to := buf.Read()
+
+		if err := Copy(ctx, from, to, newRoot); err != nil {
+			return cid.Undef, fmt.Errorf("copying migrated tree: %w", err)
+		}
+	}
+
+	return newRoot, nil
+}
+
 func (c *ChainFork) GetForkUpgrade() *config.ForkUpgradeConfig {
 	return c.forkUpgrade
 }