diff --git a/chain/actors/builtin/miner/actor.go.template b/chain/actors/builtin/miner/actor.go.template
index 7319ee9c5..fefa240aa 100644
--- a/chain/actors/builtin/miner/actor.go.template
+++ b/chain/actors/builtin/miner/actor.go.template
@@ -154,7 +154,7 @@ type Partition interface {
 
 type SectorOnChainInfo = minertypes.SectorOnChainInfo
 
-func PreferredSealProofTypeFromWindowPoStType(nver network.Version, proof abi.RegisteredPoStProof) (abi.RegisteredSealProof, error) {
+func PreferredSealProofTypeFromWindowPoStType(nver network.Version, proof abi.RegisteredPoStProof, configWantSynthetic bool) (abi.RegisteredSealProof, error) {
 	// We added support for the new proofs in network version 7, and removed support for the old
 	// ones in network version 8.
 	if nver < network.Version7 {
@@ -174,17 +174,34 @@ func PreferredSealProofTypeFromWindowPoStType(nver network.Version, proof abi.Re
 		}
 	}
 
+	if nver < network.SyntheticVersion || !configWantSynthetic {
+		switch proof {
+		case abi.RegisteredPoStProof_StackedDrgWindow2KiBV1, abi.RegisteredPoStProof_StackedDrgWindow2KiBV1_1:
+			return abi.RegisteredSealProof_StackedDrg2KiBV1_1, nil
+		case abi.RegisteredPoStProof_StackedDrgWindow8MiBV1, abi.RegisteredPoStProof_StackedDrgWindow8MiBV1_1:
+			return abi.RegisteredSealProof_StackedDrg8MiBV1_1, nil
+		case abi.RegisteredPoStProof_StackedDrgWindow512MiBV1, abi.RegisteredPoStProof_StackedDrgWindow512MiBV1_1:
+			return abi.RegisteredSealProof_StackedDrg512MiBV1_1, nil
+		case abi.RegisteredPoStProof_StackedDrgWindow32GiBV1, abi.RegisteredPoStProof_StackedDrgWindow32GiBV1_1:
+			return abi.RegisteredSealProof_StackedDrg32GiBV1_1, nil
+		case abi.RegisteredPoStProof_StackedDrgWindow64GiBV1, abi.RegisteredPoStProof_StackedDrgWindow64GiBV1_1:
+			return abi.RegisteredSealProof_StackedDrg64GiBV1_1, nil
+		default:
+			return -1, xerrors.Errorf("unrecognized window post type: %d", proof)
+		}
+	}
+
 	switch proof {
 	case abi.RegisteredPoStProof_StackedDrgWindow2KiBV1, abi.RegisteredPoStProof_StackedDrgWindow2KiBV1_1:
-		return abi.RegisteredSealProof_StackedDrg2KiBV1_1, nil
+		return abi.RegisteredSealProof_StackedDrg2KiBV1_1_Feat_SyntheticPoRep, nil
 	case abi.RegisteredPoStProof_StackedDrgWindow8MiBV1, abi.RegisteredPoStProof_StackedDrgWindow8MiBV1_1:
-		return abi.RegisteredSealProof_StackedDrg8MiBV1_1, nil
+		return abi.RegisteredSealProof_StackedDrg8MiBV1_1_Feat_SyntheticPoRep, nil
 	case abi.RegisteredPoStProof_StackedDrgWindow512MiBV1, abi.RegisteredPoStProof_StackedDrgWindow512MiBV1_1:
-		return abi.RegisteredSealProof_StackedDrg512MiBV1_1, nil
+		return abi.RegisteredSealProof_StackedDrg512MiBV1_1_Feat_SyntheticPoRep, nil
 	case abi.RegisteredPoStProof_StackedDrgWindow32GiBV1, abi.RegisteredPoStProof_StackedDrgWindow32GiBV1_1:
-		return abi.RegisteredSealProof_StackedDrg32GiBV1_1, nil
+		return abi.RegisteredSealProof_StackedDrg32GiBV1_1_Feat_SyntheticPoRep, nil
 	case abi.RegisteredPoStProof_StackedDrgWindow64GiBV1, abi.RegisteredPoStProof_StackedDrgWindow64GiBV1_1:
-		return abi.RegisteredSealProof_StackedDrg64GiBV1_1, nil
+		return abi.RegisteredSealProof_StackedDrg64GiBV1_1_Feat_SyntheticPoRep, nil
 	default:
 		return -1, xerrors.Errorf("unrecognized window post type: %d", proof)
 	}
diff --git a/cmd/lotus-sim/simulation/stages/precommit_stage.go b/cmd/lotus-sim/simulation/stages/precommit_stage.go
index aa8b80406..5373ebe54 100644
--- a/cmd/lotus-sim/simulation/stages/precommit_stage.go
+++ b/cmd/lotus-sim/simulation/stages/precommit_stage.go
@@ -165,7 +165,7 @@ func (stage *PreCommitStage) packMiner(
 
 	// Generate pre-commits.
 	sealType, err := miner.PreferredSealProofTypeFromWindowPoStType(
-		nv, minerInfo.WindowPoStProofType, false
+		nv, minerInfo.WindowPoStProofType, false,
 	)
 	if err != nil {
 		return 0, false, err
diff --git a/extern/go-state-types b/extern/go-state-types
index 4eb1d6f3a..e1dbd72a2 160000
--- a/extern/go-state-types
+++ b/extern/go-state-types
@@ -1 +1 @@
-Subproject commit 4eb1d6f3ac13b24f2bd005878ede9777522bc300
+Subproject commit e1dbd72a20b85d1d1451c69a673f325bbfc6c6ee