diff --git a/.github/workflows/stable-spec-tests.yml b/.github/workflows/stable-spec-tests.yml
index fe13e2fd02f3..f18561971a4f 100644
--- a/.github/workflows/stable-spec-tests.yml
+++ b/.github/workflows/stable-spec-tests.yml
@@ -8,7 +8,7 @@ on:
   workflow_dispatch:
 
 env:
-  FIXTURES_TAG: "verkle@v0.0.7-alpha-4"
+  FIXTURES_TAG: "verkle@v0.0.7-alpha-8"
 
 jobs:
   setup:
diff --git a/cmd/evm/internal/t8ntool/execution.go b/cmd/evm/internal/t8ntool/execution.go
index 1a95f4cd0f37..2fb49139d71f 100644
--- a/cmd/evm/internal/t8ntool/execution.go
+++ b/cmd/evm/internal/t8ntool/execution.go
@@ -69,7 +69,7 @@ type ExecutionResult struct {
 	// Verkle witness
 	VerkleProof *verkle.VerkleProof `json:"verkleProof,omitempty"`
 	StateDiff   verkle.StateDiff    `json:"stateDiff,omitempty"`
-	ParentRoot  common.Hash         `json:"parentRoot,omitempty"`
+	ParentRoot  common.Hash         `json:"parentStateRoot,omitempty"`
 
 	// Values to test the verkle conversion
 	CurrentAccountAddress *common.Address `json:"currentConversionAddress,omitempty" gencodec:"optional"`
diff --git a/core/block_validator.go b/core/block_validator.go
index 8014fbeef680..4f15087e62b6 100644
--- a/core/block_validator.go
+++ b/core/block_validator.go
@@ -133,18 +133,18 @@ func (v *BlockValidator) ValidateState(block *types.Block, statedb *state.StateD
 		return fmt.Errorf("invalid merkle root (remote: %x local: %x) dberr: %w", header.Root, root, statedb.Error())
 	}
 	if blockEw := block.ExecutionWitness(); blockEw != nil {
-		parent := v.bc.GetHeaderByNumber(header.Number.Uint64() - 1)
+		parent := v.bc.GetBlockByHash(header.ParentHash)
 		if parent == nil {
 			return fmt.Errorf("nil parent header for block %d", header.Number)
 		}
-		stateDiff, proof, err := beacon.BuildVerkleProof(header, statedb, parent.Root)
+		stateDiff, proof, err := beacon.BuildVerkleProof(header, statedb, parent.Root())
 		if err != nil {
 			return fmt.Errorf("error building verkle proof: %w", err)
 		}
 		ew := types.ExecutionWitness{
 			StateDiff:       stateDiff,
 			VerkleProof:     proof,
-			ParentStateRoot: parent.Root,
+			ParentStateRoot: parent.Root(),
 		}
 		if err := ew.Equal(blockEw); err != nil {
 			return fmt.Errorf("invalid execution witness: %v", err)
diff --git a/core/types/block.go b/core/types/block.go
index 6a6617504e59..1e41a4fbf995 100644
--- a/core/types/block.go
+++ b/core/types/block.go
@@ -62,7 +62,7 @@ func (n *BlockNonce) UnmarshalText(input []byte) error {
 type ExecutionWitness struct {
 	StateDiff       verkle.StateDiff    `json:"stateDiff"`
 	VerkleProof     *verkle.VerkleProof `json:"verkleProof"`
-	ParentStateRoot common.Hash         `json:"parentRoot"`
+	ParentStateRoot common.Hash         `json:"parentStateRoot"`
 }
 
 func (ew *ExecutionWitness) Copy() *ExecutionWitness {