diff --git a/chain/actors/builtin/verifreg/actor.go.template b/chain/actors/builtin/verifreg/actor.go.template
index 9f9efef92..9b779a68d 100644
--- a/chain/actors/builtin/verifreg/actor.go.template
+++ b/chain/actors/builtin/verifreg/actor.go.template
@@ -83,6 +83,7 @@ type State interface {
 	GetAllocations(clientIdAddr address.Address) (map[AllocationId]Allocation, error)
 	GetClaim(providerIdAddr address.Address, claimId ClaimId) (*Claim, bool, error)
 	GetClaims(providerIdAddr address.Address) (map[ClaimId]Claim, error)
+	GetClaimIdsBySector(providerIdAddr address.Address) (map[abi.SectorNumber][]ClaimId, error)
 	GetState() interface{}
 }
 
diff --git a/chain/actors/builtin/verifreg/state.go.template b/chain/actors/builtin/verifreg/state.go.template
index 526dff54e..adcbc22c2 100644
--- a/chain/actors/builtin/verifreg/state.go.template
+++ b/chain/actors/builtin/verifreg/state.go.template
@@ -170,6 +170,27 @@ func (s *state{{.v}}) GetClaims(providerIdAddr address.Address) (map[ClaimId]Cla
 {{end}}
 }
 
+func (s *state{{.v}}) GetClaimIdsBySector(providerIdAddr address.Address) (map[abi.SectorNumber][]ClaimId, error) {
+{{if (le .v 8)}}
+    return nil, xerrors.Errorf("unsupported in actors v{{.v}}")
+{{else}}
+	v{{.v}}Map, err := s.LoadClaimsToMap(s.store, providerIdAddr)
+
+	retMap := make(map[abi.SectorNumber][]ClaimId)
+	for k, v := range v{{.v}}Map {
+		claims, ok := retMap[v.Sector]
+		if !ok {
+			retMap[v.Sector] = []ClaimId{ClaimId(k)}
+		} else {
+			retMap[v.Sector] = append(claims, ClaimId(k))
+		}
+	}
+
+	return retMap, err
+
+{{end}}
+}
+
 func (s *state{{.v}}) ActorKey() string {
     return manifest.VerifregKey
 }
diff --git a/chain/actors/builtin/verifreg/v0.go b/chain/actors/builtin/verifreg/v0.go
index 8d97ebbc2..9913c42c0 100644
--- a/chain/actors/builtin/verifreg/v0.go
+++ b/chain/actors/builtin/verifreg/v0.go
@@ -118,6 +118,12 @@ func (s *state0) GetClaims(providerIdAddr address.Address) (map[ClaimId]Claim, e
 
 }
 
+func (s *state0) GetClaimIdsBySector(providerIdAddr address.Address) (map[abi.SectorNumber][]ClaimId, error) {
+
+	return nil, xerrors.Errorf("unsupported in actors v0")
+
+}
+
 func (s *state0) ActorKey() string {
 	return manifest.VerifregKey
 }
diff --git a/chain/actors/builtin/verifreg/v10.go b/chain/actors/builtin/verifreg/v10.go
index 63b161da3..256f4d2f8 100644
--- a/chain/actors/builtin/verifreg/v10.go
+++ b/chain/actors/builtin/verifreg/v10.go
@@ -134,6 +134,24 @@ func (s *state10) GetClaims(providerIdAddr address.Address) (map[ClaimId]Claim,
 
 }
 
+func (s *state10) GetClaimIdsBySector(providerIdAddr address.Address) (map[abi.SectorNumber][]ClaimId, error) {
+
+	v10Map, err := s.LoadClaimsToMap(s.store, providerIdAddr)
+
+	retMap := make(map[abi.SectorNumber][]ClaimId)
+	for k, v := range v10Map {
+		claims, ok := retMap[v.Sector]
+		if !ok {
+			retMap[v.Sector] = []ClaimId{ClaimId(k)}
+		} else {
+			retMap[v.Sector] = append(claims, ClaimId(k))
+		}
+	}
+
+	return retMap, err
+
+}
+
 func (s *state10) ActorKey() string {
 	return manifest.VerifregKey
 }
diff --git a/chain/actors/builtin/verifreg/v2.go b/chain/actors/builtin/verifreg/v2.go
index 61c175c7a..31f7f775d 100644
--- a/chain/actors/builtin/verifreg/v2.go
+++ b/chain/actors/builtin/verifreg/v2.go
@@ -118,6 +118,12 @@ func (s *state2) GetClaims(providerIdAddr address.Address) (map[ClaimId]Claim, e
 
 }
 
+func (s *state2) GetClaimIdsBySector(providerIdAddr address.Address) (map[abi.SectorNumber][]ClaimId, error) {
+
+	return nil, xerrors.Errorf("unsupported in actors v2")
+
+}
+
 func (s *state2) ActorKey() string {
 	return manifest.VerifregKey
 }
diff --git a/chain/actors/builtin/verifreg/v3.go b/chain/actors/builtin/verifreg/v3.go
index 5ba478500..3ea016fd5 100644
--- a/chain/actors/builtin/verifreg/v3.go
+++ b/chain/actors/builtin/verifreg/v3.go
@@ -119,6 +119,12 @@ func (s *state3) GetClaims(providerIdAddr address.Address) (map[ClaimId]Claim, e
 
 }
 
+func (s *state3) GetClaimIdsBySector(providerIdAddr address.Address) (map[abi.SectorNumber][]ClaimId, error) {
+
+	return nil, xerrors.Errorf("unsupported in actors v3")
+
+}
+
 func (s *state3) ActorKey() string {
 	return manifest.VerifregKey
 }
diff --git a/chain/actors/builtin/verifreg/v4.go b/chain/actors/builtin/verifreg/v4.go
index 3ad739f68..464cc9fdc 100644
--- a/chain/actors/builtin/verifreg/v4.go
+++ b/chain/actors/builtin/verifreg/v4.go
@@ -119,6 +119,12 @@ func (s *state4) GetClaims(providerIdAddr address.Address) (map[ClaimId]Claim, e
 
 }
 
+func (s *state4) GetClaimIdsBySector(providerIdAddr address.Address) (map[abi.SectorNumber][]ClaimId, error) {
+
+	return nil, xerrors.Errorf("unsupported in actors v4")
+
+}
+
 func (s *state4) ActorKey() string {
 	return manifest.VerifregKey
 }
diff --git a/chain/actors/builtin/verifreg/v5.go b/chain/actors/builtin/verifreg/v5.go
index 1ffe06f3f..17901dd23 100644
--- a/chain/actors/builtin/verifreg/v5.go
+++ b/chain/actors/builtin/verifreg/v5.go
@@ -119,6 +119,12 @@ func (s *state5) GetClaims(providerIdAddr address.Address) (map[ClaimId]Claim, e
 
 }
 
+func (s *state5) GetClaimIdsBySector(providerIdAddr address.Address) (map[abi.SectorNumber][]ClaimId, error) {
+
+	return nil, xerrors.Errorf("unsupported in actors v5")
+
+}
+
 func (s *state5) ActorKey() string {
 	return manifest.VerifregKey
 }
diff --git a/chain/actors/builtin/verifreg/v6.go b/chain/actors/builtin/verifreg/v6.go
index 9786838d1..68fac64cb 100644
--- a/chain/actors/builtin/verifreg/v6.go
+++ b/chain/actors/builtin/verifreg/v6.go
@@ -119,6 +119,12 @@ func (s *state6) GetClaims(providerIdAddr address.Address) (map[ClaimId]Claim, e
 
 }
 
+func (s *state6) GetClaimIdsBySector(providerIdAddr address.Address) (map[abi.SectorNumber][]ClaimId, error) {
+
+	return nil, xerrors.Errorf("unsupported in actors v6")
+
+}
+
 func (s *state6) ActorKey() string {
 	return manifest.VerifregKey
 }
diff --git a/chain/actors/builtin/verifreg/v7.go b/chain/actors/builtin/verifreg/v7.go
index e63e27742..e8f3ac739 100644
--- a/chain/actors/builtin/verifreg/v7.go
+++ b/chain/actors/builtin/verifreg/v7.go
@@ -118,6 +118,12 @@ func (s *state7) GetClaims(providerIdAddr address.Address) (map[ClaimId]Claim, e
 
 }
 
+func (s *state7) GetClaimIdsBySector(providerIdAddr address.Address) (map[abi.SectorNumber][]ClaimId, error) {
+
+	return nil, xerrors.Errorf("unsupported in actors v7")
+
+}
+
 func (s *state7) ActorKey() string {
 	return manifest.VerifregKey
 }
diff --git a/chain/actors/builtin/verifreg/v8.go b/chain/actors/builtin/verifreg/v8.go
index a1edeba34..89393c4d9 100644
--- a/chain/actors/builtin/verifreg/v8.go
+++ b/chain/actors/builtin/verifreg/v8.go
@@ -118,6 +118,12 @@ func (s *state8) GetClaims(providerIdAddr address.Address) (map[ClaimId]Claim, e
 
 }
 
+func (s *state8) GetClaimIdsBySector(providerIdAddr address.Address) (map[abi.SectorNumber][]ClaimId, error) {
+
+	return nil, xerrors.Errorf("unsupported in actors v8")
+
+}
+
 func (s *state8) ActorKey() string {
 	return manifest.VerifregKey
 }
diff --git a/chain/actors/builtin/verifreg/v9.go b/chain/actors/builtin/verifreg/v9.go
index bf6424ba7..ce63c7f94 100644
--- a/chain/actors/builtin/verifreg/v9.go
+++ b/chain/actors/builtin/verifreg/v9.go
@@ -133,6 +133,24 @@ func (s *state9) GetClaims(providerIdAddr address.Address) (map[ClaimId]Claim, e
 
 }
 
+func (s *state9) GetClaimIdsBySector(providerIdAddr address.Address) (map[abi.SectorNumber][]ClaimId, error) {
+
+	v9Map, err := s.LoadClaimsToMap(s.store, providerIdAddr)
+
+	retMap := make(map[abi.SectorNumber][]ClaimId)
+	for k, v := range v9Map {
+		claims, ok := retMap[v.Sector]
+		if !ok {
+			retMap[v.Sector] = []ClaimId{ClaimId(k)}
+		} else {
+			retMap[v.Sector] = append(claims, ClaimId(k))
+		}
+	}
+
+	return retMap, err
+
+}
+
 func (s *state9) ActorKey() string {
 	return manifest.VerifregKey
 }
diff --git a/chain/actors/builtin/verifreg/verifreg.go b/chain/actors/builtin/verifreg/verifreg.go
index 1380a9207..8e025b242 100644
--- a/chain/actors/builtin/verifreg/verifreg.go
+++ b/chain/actors/builtin/verifreg/verifreg.go
@@ -131,6 +131,7 @@ type State interface {
 	GetAllocations(clientIdAddr address.Address) (map[AllocationId]Allocation, error)
 	GetClaim(providerIdAddr address.Address, claimId ClaimId) (*Claim, bool, error)
 	GetClaims(providerIdAddr address.Address) (map[ClaimId]Claim, error)
+	GetClaimIdsBySector(providerIdAddr address.Address) (map[abi.SectorNumber][]ClaimId, error)
 	GetState() interface{}
 }
 
diff --git a/cmd/lotus-miner/sectors.go b/cmd/lotus-miner/sectors.go
index 6ff84b3fa..93c950d7c 100644
--- a/cmd/lotus-miner/sectors.go
+++ b/cmd/lotus-miner/sectors.go
@@ -30,6 +30,7 @@ import (
 	"github.com/filecoin-project/lotus/chain/actors"
 	"github.com/filecoin-project/lotus/chain/actors/adt"
 	lminer "github.com/filecoin-project/lotus/chain/actors/builtin/miner"
+	"github.com/filecoin-project/lotus/chain/actors/builtin/verifreg"
 	"github.com/filecoin-project/lotus/chain/actors/policy"
 	"github.com/filecoin-project/lotus/chain/types"
 	lcli "github.com/filecoin-project/lotus/cli"
@@ -709,7 +710,7 @@ type PseudoExtendSectorExpirationParams struct {
 	Extensions []PseudoExpirationExtension
 }
 
-func NewPseudoExtendParams(p *miner.ExtendSectorExpirationParams) (*PseudoExtendSectorExpirationParams, error) {
+func NewPseudoExtendParams(p *miner.ExtendSectorExpiration2Params) (*PseudoExtendSectorExpirationParams, error) {
 	res := PseudoExtendSectorExpirationParams{}
 	for _, ext := range p.Extensions {
 		scount, err := ext.Sectors.Count()
@@ -833,6 +834,10 @@ var sectorsExtendCmd = &cli.Command{
 			Name:  "only-cc",
 			Usage: "only extend CC sectors (useful for making sector ready for snap upgrade)",
 		},
+		&cli.BoolFlag{
+			Name:  "drop-claims",
+			Usage: "drop claims for sectors that can be extended, but only by dropping some of their verified power claims",
+		},
 		&cli.Int64Flag{
 			Name:  "tolerance",
 			Usage: "don't try to extend sectors by fewer than this number of epochs, defaults to 7 days",
@@ -845,7 +850,7 @@ var sectorsExtendCmd = &cli.Command{
 		},
 		&cli.Int64Flag{
 			Name:  "max-sectors",
-			Usage: "the maximum number of sectors contained in each message message",
+			Usage: "the maximum number of sectors contained in each message",
 		},
 		&cli.BoolFlag{
 			Name:  "really-do-it",
@@ -900,7 +905,8 @@ var sectorsExtendCmd = &cli.Command{
 		}
 
 		tbs := blockstore.NewTieredBstore(blockstore.NewAPIBlockstore(fullApi), blockstore.NewMemory())
-		mas, err := lminer.Load(adt.WrapStore(ctx, cbor.NewCborStore(tbs)), mact)
+		adtStore := adt.WrapStore(ctx, cbor.NewCborStore(tbs))
+		mas, err := lminer.Load(adtStore, mact)
 		if err != nil {
 			return err
 		}
@@ -1051,44 +1057,124 @@ var sectorsExtendCmd = &cli.Command{
 			}
 		}
 
-		var params []miner.ExtendSectorExpirationParams
+		verifregAct, err := fullApi.StateGetActor(ctx, builtin.VerifiedRegistryActorAddr, types.EmptyTSK)
+		if err != nil {
+			return xerrors.Errorf("failed to lookup verifreg actor: %w", err)
+		}
 
-		p := miner.ExtendSectorExpirationParams{}
+		verifregSt, err := verifreg.Load(adtStore, verifregAct)
+		if err != nil {
+			return xerrors.Errorf("failed to load verifreg state: %w", err)
+		}
+
+		claimsMap, err := verifregSt.GetClaims(maddr)
+		if err != nil {
+			return xerrors.Errorf("failed to lookup claims for miner: %w", err)
+		}
+
+		claimIdsBySector, err := verifregSt.GetClaimIdsBySector(maddr)
+		if err != nil {
+			return xerrors.Errorf("failed to lookup claim IDs by sector: %w", err)
+		}
+
+		sectorsMax, err := policy.GetAddressedSectorsMax(nv)
+		if err != nil {
+			return err
+		}
+
+		declMax, err := policy.GetDeclarationsMax(nv)
+		if err != nil {
+			return err
+		}
+
+		addrSectors := sectorsMax
+		if cctx.Int("max-sectors") != 0 {
+			addrSectors = cctx.Int("max-sectors")
+			if addrSectors > sectorsMax {
+				return xerrors.Errorf("the specified max-sectors exceeds the maximum limit")
+			}
+		}
+
+		var params []miner.ExtendSectorExpiration2Params
+
+		p := miner.ExtendSectorExpiration2Params{}
 		scount := 0
 
 		for l, exts := range extensions {
 			for newExp, numbers := range exts {
-				scount += len(numbers)
-				var addrSectors int
-				sectorsMax, err := policy.GetAddressedSectorsMax(nv)
-				if err != nil {
-					return err
-				}
-				if cctx.Int("max-sectors") == 0 {
-					addrSectors = sectorsMax
-				} else {
-					addrSectors = cctx.Int("max-sectors")
-					if addrSectors > sectorsMax {
-						return xerrors.Errorf("the specified max-sectors exceeds the maximum limit")
+				sectorsWithoutClaimsToExtend := bitfield.New()
+				var sectorsWithClaims []miner.SectorClaim
+				for _, sectorNumber := range numbers {
+					claimIdsToMaintain := make([]verifreg.ClaimId, 0)
+					claimIdsToDrop := make([]verifreg.ClaimId, 0)
+					cannotExtendSector := false
+					claimIds, ok := claimIdsBySector[sectorNumber]
+					// Nothing to check, add to ccSectors
+					if !ok {
+						sectorsWithoutClaimsToExtend.Set(uint64(sectorNumber))
+					} else {
+						for _, claimId := range claimIds {
+							claim, ok := claimsMap[claimId]
+							if !ok {
+								return xerrors.Errorf("failed to find claim for claimId %d", claimId)
+							}
+							claimExpiration := claim.TermStart + claim.TermMax
+							// can be maintained in the extended sector
+							if claimExpiration > newExp {
+								claimIdsToMaintain = append(claimIdsToMaintain, claimId)
+							} else {
+								sectorInfo, ok := activeSectorsInfo[sectorNumber]
+								if !ok {
+									return xerrors.Errorf("failed to find sector in active sector set: %w", err)
+								}
+								if !cctx.Bool("drop-claims") ||
+									// FIP-0045 requires the claim minimum duration to have passed
+									currEpoch <= (claim.TermStart+claim.TermMin) ||
+									// FIP-0045 requires the sector to be in its last 30 days of life
+									(currEpoch <= sectorInfo.Expiration-builtin.EndOfLifeClaimDropPeriod) {
+									fmt.Printf("skipping sector %d because claim %d does not live long enough \n", sectorNumber, claimId)
+									cannotExtendSector = true
+									break
+								}
+
+								claimIdsToDrop = append(claimIdsToDrop, claimId)
+							}
+						}
+						if cannotExtendSector {
+							continue
+						}
+
+						if len(claimIdsToMaintain)+len(claimIdsToDrop) != 0 {
+							sectorsWithClaims = append(sectorsWithClaims, miner.SectorClaim{
+								SectorNumber:   sectorNumber,
+								MaintainClaims: claimIdsToMaintain,
+								DropClaims:     claimIdsToDrop,
+							})
+						}
 					}
 				}
 
-				declMax, err := policy.GetDeclarationsMax(nv)
+				sectorsWithoutClaimsCount, err := sectorsWithoutClaimsToExtend.Count()
 				if err != nil {
-					return err
-				}
-				if scount > addrSectors || len(p.Extensions) == declMax {
-					params = append(params, p)
-					p = miner.ExtendSectorExpirationParams{}
-					scount = len(numbers)
+					return xerrors.Errorf("failed to count cc sectors: %w", err)
 				}
 
-				p.Extensions = append(p.Extensions, miner.ExpirationExtension{
-					Deadline:      l.Deadline,
-					Partition:     l.Partition,
-					Sectors:       SectorNumsToBitfield(numbers),
-					NewExpiration: newExp,
+				sectorsInDecl := int(sectorsWithoutClaimsCount) + len(sectorsWithClaims)
+
+				if scount+sectorsInDecl > addrSectors || len(p.Extensions) >= declMax {
+					params = append(params, p)
+					p = miner.ExtendSectorExpiration2Params{}
+					scount = sectorsInDecl
+				}
+
+				p.Extensions = append(p.Extensions, miner.ExpirationExtension2{
+					Deadline:          l.Deadline,
+					Partition:         l.Partition,
+					Sectors:           SectorNumsToBitfield(numbers),
+					SectorsWithClaims: sectorsWithClaims,
+					NewExpiration:     newExp,
 				})
+
 			}
 		}
 
diff --git a/documentation/en/cli-lotus-miner.md b/documentation/en/cli-lotus-miner.md
index 94fec03fd..cedb422ec 100644
--- a/documentation/en/cli-lotus-miner.md
+++ b/documentation/en/cli-lotus-miner.md
@@ -1889,11 +1889,12 @@ USAGE:
    lotus-miner sectors extend [command options] <sectorNumbers...(optional)>
 
 OPTIONS:
+   --drop-claims           drop claims for sectors that can be extended, but only by dropping some of their verified power claims (default: false)
    --exclude value         optionally provide a file containing excluding sectors
    --extension value       try to extend selected sectors by this number of epochs, defaults to 540 days (default: 1555200)
    --from value            only consider sectors whose current expiration epoch is in the range of [from, to], <from> defaults to: now + 120 (1 hour) (default: 0)
    --max-fee value         use up to this amount of FIL for one message. pass this flag to avoid message congestion. (default: "0")
-   --max-sectors value     the maximum number of sectors contained in each message message (default: 0)
+   --max-sectors value     the maximum number of sectors contained in each message (default: 0)
    --new-expiration value  try to extend selected sectors to this epoch, ignoring extension (default: 0)
    --only-cc               only extend CC sectors (useful for making sector ready for snap upgrade) (default: false)
    --really-do-it          pass this flag to really extend sectors, otherwise will only print out json representation of parameters (default: false)