diff --git a/dot/services.go b/dot/services.go
index 231a13fe5d..a1be078375 100644
--- a/dot/services.go
+++ b/dot/services.go
@@ -530,6 +530,7 @@ func (nodeBuilder) newSyncService(config *cfg.Config, st *state.Service, fg sync
 		BlockImportHandler: cs,
 		Telemetry:          telemetryMailer,
 		BadBlocks:          genesisData.BadBlocks,
+		GrandpaState:       st.Grandpa,
 		RequestMaker:       requestMaker,
 	}
 	fullSync := sync.NewFullSyncStrategy(syncCfg)
diff --git a/dot/sync/block_importer.go b/dot/sync/block_importer.go
index 395113c8a4..c5ae40b8e0 100644
--- a/dot/sync/block_importer.go
+++ b/dot/sync/block_importer.go
@@ -52,6 +52,11 @@ type (
 		VerifyBlockJustification(common.Hash, uint, []byte) (round uint64, setID uint64, err error)
 	}
 
+	// GrandpaState is the interface for the state.GrandpaState
+	GrandpaState interface {
+		ApplyForcedChanges(importedHeader *types.Header) error
+	}
+
 	// BlockImportHandler is the interface for the handler of newly imported blocks
 	BlockImportHandler interface {
 		HandleBlockImport(block *types.Block, state *rtstorage.TrieState, announce bool) error
@@ -64,6 +69,7 @@ type blockImporter struct {
 	transactionState   TransactionState
 	babeVerifier       BabeVerifier
 	finalityGadget     FinalityGadget
+	grandpaState       GrandpaState
 	blockImportHandler BlockImportHandler
 	telemetry          Telemetry
 }
@@ -75,6 +81,7 @@ func newBlockImporter(cfg *FullSyncConfig) *blockImporter {
 		transactionState:   cfg.TransactionState,
 		babeVerifier:       cfg.BabeVerifier,
 		finalityGadget:     cfg.FinalityGadget,
+		grandpaState:       cfg.GrandpaState,
 		blockImportHandler: cfg.BlockImportHandler,
 		telemetry:          cfg.Telemetry,
 	}
@@ -104,31 +111,45 @@ func (b *blockImporter) importBlock(bd *types.BlockData, origin BlockOrigin) (im
 // or the index of the block data that errored on failure.
 func (b *blockImporter) processBlockData(blockData types.BlockData, origin BlockOrigin) error {
 	if blockData.Header != nil {
-		header := blockData.Header
+		var (
+			hasJustification = blockData.Justification != nil && len(*blockData.Justification) > 0
+			round            uint64
+			setID            uint64
+		)
 
-		if blockData.Body != nil {
-			err := b.processBlockDataWithHeaderAndBody(blockData, origin)
+		err := b.grandpaState.ApplyForcedChanges(blockData.Header)
+		if err != nil {
+			return fmt.Errorf("applying forced changes: %w", err)
+		}
+
+		if hasJustification {
+			var err error
+			round, setID, err = b.finalityGadget.VerifyBlockJustification(
+				blockData.Header.Hash(), blockData.Header.Number, *blockData.Justification)
 			if err != nil {
-				return fmt.Errorf("processing block data with header and body: %w", err)
+				return fmt.Errorf("verifying justification: %w", err)
 			}
 		}
 
-		if blockData.Justification != nil && len(*blockData.Justification) > 0 {
-			round, setID, err := b.finalityGadget.VerifyBlockJustification(
-				header.Hash(), header.Number, *blockData.Justification)
+		if blockData.Body != nil {
+			err := b.processBlockDataWithHeaderAndBody(blockData, origin)
 			if err != nil {
-				return fmt.Errorf("verifying justification for block %s: %w", header.Hash().String(), err)
+				return fmt.Errorf("processing block data with header and body: %w", err)
 			}
+		}
 
-			err = b.blockState.SetFinalisedHash(header.Hash(), round, setID)
+		if hasJustification {
+			header := blockData.Header
+			err := b.blockState.SetFinalisedHash(header.Hash(), round, setID)
 			if err != nil {
 				return fmt.Errorf("setting finalised hash: %w", err)
 			}
-
 			err = b.blockState.SetJustification(header.Hash(), *blockData.Justification)
 			if err != nil {
 				return fmt.Errorf("setting justification for block number %d: %w", header.Number, err)
 			}
+
+			return nil
 		}
 	}
 	err := b.blockState.CompareAndSetBlockData(&blockData)
diff --git a/dot/sync/fullsync.go b/dot/sync/fullsync.go
index 862e74327e..f87f83fbad 100644
--- a/dot/sync/fullsync.go
+++ b/dot/sync/fullsync.go
@@ -37,6 +37,7 @@ type FullSyncConfig struct {
 	TransactionState   TransactionState
 	BabeVerifier       BabeVerifier
 	FinalityGadget     FinalityGadget
+	GrandpaState       GrandpaState
 	BlockImportHandler BlockImportHandler
 	Telemetry          Telemetry
 	BlockState         BlockState