diff --git a/chain/stmgr/forks_test.go b/chain/stmgr/forks_test.go
index fbf7b6785b0..d85aa810f72 100644
--- a/chain/stmgr/forks_test.go
+++ b/chain/stmgr/forks_test.go
@@ -166,7 +166,7 @@ func TestForkHeightTriggers(t *testing.T) {
 	inv := filcns.NewActorRegistry()
 	inv.Register(nil, testActor{})
 
-	sm.SetVMConstructor(func(ctx context.Context, vmopt *vm.VMOpts) (*vm.VM, error) {
+	sm.SetVMConstructor(func(ctx context.Context, vmopt *vm.VMOpts) (vm.VMI, error) {
 		nvm, err := vm.NewLotusVM(ctx, vmopt)
 		if err != nil {
 			return nil, err
@@ -281,7 +281,7 @@ func testForkRefuseCall(t *testing.T, nullsBefore, nullsAfter int) {
 	inv := filcns.NewActorRegistry()
 	inv.Register(nil, testActor{})
 
-	sm.SetVMConstructor(func(ctx context.Context, vmopt *vm.VMOpts) (*vm.VM, error) {
+	sm.SetVMConstructor(func(ctx context.Context, vmopt *vm.VMOpts) (vm.VMI, error) {
 		nvm, err := vm.NewLotusVM(ctx, vmopt)
 		if err != nil {
 			return nil, err
@@ -500,7 +500,7 @@ func TestForkPreMigration(t *testing.T) {
 	inv := filcns.NewActorRegistry()
 	inv.Register(nil, testActor{})
 
-	sm.SetVMConstructor(func(ctx context.Context, vmopt *vm.VMOpts) (*vm.VM, error) {
+	sm.SetVMConstructor(func(ctx context.Context, vmopt *vm.VMOpts) (vm.VMI, error) {
 		nvm, err := vm.NewLotusVM(ctx, vmopt)
 		if err != nil {
 			return nil, err
diff --git a/chain/vm/fvm.go b/chain/vm/fvm.go
index 743e0fdeeb1..c8f8a0d9e19 100644
--- a/chain/vm/fvm.go
+++ b/chain/vm/fvm.go
@@ -5,6 +5,8 @@ import (
 	"context"
 	"time"
 
+	"github.com/filecoin-project/go-state-types/network"
+
 	"github.com/filecoin-project/go-state-types/big"
 
 	"github.com/filecoin-project/lotus/build"
@@ -215,9 +217,24 @@ type FVM struct {
 }
 
 func NewFVM(ctx context.Context, opts *VMOpts) (*FVM, error) {
+	circToReport := opts.FilVested
+	// For v14 (and earlier), we perform the FilVested portion of the calculation, and let the FVM dynamically do the rest
+	// v15 and after, the circ supply is always constant per epoch, so we calculate the base and report it at creation
+	if opts.NetworkVersion >= network.Version15 {
+		state, err := state.LoadStateTree(cbor.NewCborStore(opts.Bstore), opts.StateBase)
+		if err != nil {
+			return nil, err
+		}
+
+		circToReport, err = opts.CircSupplyCalc(ctx, opts.Epoch, state)
+		if err != nil {
+			return nil, err
+		}
+	}
+
 	fvm, err := ffi.CreateFVM(0,
 		&FvmExtern{Rand: opts.Rand, Blockstore: opts.Bstore, lbState: opts.LookbackState, base: opts.StateBase, epoch: opts.Epoch},
-		opts.Epoch, opts.BaseFee, opts.FilVested, opts.NetworkVersion, opts.StateBase,
+		opts.Epoch, opts.BaseFee, circToReport, opts.NetworkVersion, opts.StateBase,
 	)
 	if err != nil {
 		return nil, err
diff --git a/conformance/driver.go b/conformance/driver.go
index 6af4372d2ec..0a24f07ef15 100644
--- a/conformance/driver.go
+++ b/conformance/driver.go
@@ -155,7 +155,7 @@ func (d *Driver) ExecuteTipset(bs blockstore.Blockstore, ds ds.Batching, params
 		results:  []*vm.ApplyRet{},
 	}
 
-	sm.SetVMConstructor(func(ctx context.Context, vmopt *vm.VMOpts) (*vm.VM, error) {
+	sm.SetVMConstructor(func(ctx context.Context, vmopt *vm.VMOpts) (vm.VMI, error) {
 		vmopt.CircSupplyCalc = func(context.Context, abi.ChainEpoch, *state.StateTree) (abi.TokenAmount, error) {
 			return big.Zero(), nil
 		}
diff --git a/extern/filecoin-ffi b/extern/filecoin-ffi
index 9ff2301105f..084ee8673f6 160000
--- a/extern/filecoin-ffi
+++ b/extern/filecoin-ffi
@@ -1 +1 @@
-Subproject commit 9ff2301105fcf25101f1fcda52e6417f3e2ca60b
+Subproject commit 084ee8673f6487c71b60996e6d8d6c5fa2cf04ab