diff --git a/build/checksums.txt b/build/checksums.txt
index 6e65fa47fb..ca937d115c 100644
--- a/build/checksums.txt
+++ b/build/checksums.txt
@@ -1,9 +1,9 @@
 # This file contains sha256 checksums of optional build dependencies.
 
-# version:spec-tests fusaka-devnet-3%40v1.0.0
+# version:spec-tests v5.0.0
 # https://github.com/ethereum/execution-spec-tests/releases
-# https://github.com/ethereum/execution-spec-tests/releases/download/fusaka-devnet-3%40v1.0.0
-576261e1280e5300c458aa9b05eccb2fec5ff80a0005940dc52fa03fdd907249  fixtures_fusaka-devnet-3.tar.gz
+# https://github.com/ethereum/execution-spec-tests/releases/download/v5.0.0
+a5ed96800ca1af0d86fe2ee894861c24eea079bfb83b924f565bb86ba70021d5  fixtures_develop.tar.gz
 
 # version:golang 1.25.1
 # https://go.dev/dl/
diff --git a/build/ci.go b/build/ci.go
index 6a9848876d..e145cc1cb5 100644
--- a/build/ci.go
+++ b/build/ci.go
@@ -333,7 +333,7 @@ func doTest(cmdline []string) {
 // downloadSpecTestFixtures downloads and extracts the execution-spec-tests fixtures.
 func downloadSpecTestFixtures(csdb *download.ChecksumDB, cachedir string) string {
 	ext := ".tar.gz"
-	base := "fixtures_fusaka-devnet-3"
+	base := "fixtures_develop"
 	archivePath := filepath.Join(cachedir, base+ext)
 	if err := csdb.DownloadFileFromKnownURL(archivePath); err != nil {
 		log.Fatal(err)
diff --git a/core/genesis.go b/core/genesis.go
index 2673334e9e..13d4addd7e 100644
--- a/core/genesis.go
+++ b/core/genesis.go
@@ -514,6 +514,11 @@ func (g *Genesis) toBlockWithRoot(root common.Hash) *types.Block {
 			if head.BlobGasUsed == nil {
 				head.BlobGasUsed = new(uint64)
 			}
+		} else {
+			if g.ExcessBlobGas != nil {
+				log.Warn("Invalid genesis, unexpected ExcessBlobGas set before Cancun, allowing it for testing purposes")
+				head.ExcessBlobGas = g.ExcessBlobGas
+			}
 		}
 		if conf.IsPrague(num, g.Timestamp) {
 			head.RequestsHash = &types.EmptyRequestsHash
diff --git a/params/config.go b/params/config.go
index b1297144c3..f8fc35454c 100644
--- a/params/config.go
+++ b/params/config.go
@@ -359,6 +359,30 @@ var (
 		Max:            9,
 		UpdateFraction: 5007716,
 	}
+	// DefaultBPO1BlobConfig is the default blob configuration for the Osaka fork.
+	DefaultBPO1BlobConfig = &BlobConfig{
+		Target:         9,
+		Max:            14,
+		UpdateFraction: 8832827,
+	}
+	// DefaultBPO1BlobConfig is the default blob configuration for the Osaka fork.
+	DefaultBPO2BlobConfig = &BlobConfig{
+		Target:         14,
+		Max:            21,
+		UpdateFraction: 13739630,
+	}
+	// DefaultBPO1BlobConfig is the default blob configuration for the Osaka fork.
+	DefaultBPO3BlobConfig = &BlobConfig{
+		Target:         21,
+		Max:            32,
+		UpdateFraction: 20609697,
+	}
+	// DefaultBPO1BlobConfig is the default blob configuration for the Osaka fork.
+	DefaultBPO4BlobConfig = &BlobConfig{
+		Target:         14,
+		Max:            21,
+		UpdateFraction: 13739630,
+	}
 	// DefaultBlobSchedule is the latest configured blob schedule for Ethereum mainnet.
 	DefaultBlobSchedule = &BlobScheduleConfig{
 		Cancun: DefaultCancunBlobConfig,
diff --git a/tests/block_test.go b/tests/block_test.go
index 91d9f2e653..c718b304b6 100644
--- a/tests/block_test.go
+++ b/tests/block_test.go
@@ -81,8 +81,9 @@ func TestExecutionSpecBlocktests(t *testing.T) {
 	}
 	bt := new(testMatcher)
 
-	bt.skipLoad(".*prague/eip7251_consolidations/contract_deployment/system_contract_deployment.json")
-	bt.skipLoad(".*prague/eip7002_el_triggerable_withdrawals/contract_deployment/system_contract_deployment.json")
+	// These tests require us to handle scenarios where a system contract is not deployed at a fork
+	bt.skipLoad(".*prague/eip7251_consolidations/test_system_contract_deployment.json")
+	bt.skipLoad(".*prague/eip7002_el_triggerable_withdrawals/test_system_contract_deployment.json")
 
 	bt.walk(t, executionSpecBlockchainTestDir, func(t *testing.T, name string, test *BlockTest) {
 		execBlockTest(t, bt, test)
diff --git a/tests/init.go b/tests/init.go
index a8bc424fa2..71072ac275 100644
--- a/tests/init.go
+++ b/tests/init.go
@@ -464,6 +464,262 @@ var Forks = map[string]*params.ChainConfig{
 			Osaka:  params.DefaultOsakaBlobConfig,
 		},
 	},
+	"BPO1": {
+		ChainID:                 big.NewInt(1),
+		HomesteadBlock:          big.NewInt(0),
+		EIP150Block:             big.NewInt(0),
+		EIP155Block:             big.NewInt(0),
+		EIP158Block:             big.NewInt(0),
+		ByzantiumBlock:          big.NewInt(0),
+		ConstantinopleBlock:     big.NewInt(0),
+		PetersburgBlock:         big.NewInt(0),
+		IstanbulBlock:           big.NewInt(0),
+		MuirGlacierBlock:        big.NewInt(0),
+		BerlinBlock:             big.NewInt(0),
+		LondonBlock:             big.NewInt(0),
+		ArrowGlacierBlock:       big.NewInt(0),
+		MergeNetsplitBlock:      big.NewInt(0),
+		TerminalTotalDifficulty: big.NewInt(0),
+		ShanghaiTime:            u64(0),
+		CancunTime:              u64(0),
+		PragueTime:              u64(0),
+		OsakaTime:               u64(0),
+		BPO1Time:                u64(0),
+		DepositContractAddress:  params.MainnetChainConfig.DepositContractAddress,
+		BlobScheduleConfig: &params.BlobScheduleConfig{
+			Cancun: params.DefaultCancunBlobConfig,
+			Prague: params.DefaultPragueBlobConfig,
+			Osaka:  params.DefaultOsakaBlobConfig,
+			BPO1:   params.DefaultBPO1BlobConfig,
+		},
+	},
+	"OsakaToBPO1AtTime15k": {
+		ChainID:                 big.NewInt(1),
+		HomesteadBlock:          big.NewInt(0),
+		EIP150Block:             big.NewInt(0),
+		EIP155Block:             big.NewInt(0),
+		EIP158Block:             big.NewInt(0),
+		ByzantiumBlock:          big.NewInt(0),
+		ConstantinopleBlock:     big.NewInt(0),
+		PetersburgBlock:         big.NewInt(0),
+		IstanbulBlock:           big.NewInt(0),
+		MuirGlacierBlock:        big.NewInt(0),
+		BerlinBlock:             big.NewInt(0),
+		LondonBlock:             big.NewInt(0),
+		ArrowGlacierBlock:       big.NewInt(0),
+		MergeNetsplitBlock:      big.NewInt(0),
+		TerminalTotalDifficulty: big.NewInt(0),
+		ShanghaiTime:            u64(0),
+		CancunTime:              u64(0),
+		PragueTime:              u64(0),
+		OsakaTime:               u64(0),
+		BPO1Time:                u64(15_000),
+		DepositContractAddress:  params.MainnetChainConfig.DepositContractAddress,
+		BlobScheduleConfig: &params.BlobScheduleConfig{
+			Cancun: params.DefaultCancunBlobConfig,
+			Prague: params.DefaultPragueBlobConfig,
+			Osaka:  params.DefaultOsakaBlobConfig,
+			BPO1:   params.DefaultBPO1BlobConfig,
+		},
+	},
+	"BPO2": {
+		ChainID:                 big.NewInt(1),
+		HomesteadBlock:          big.NewInt(0),
+		EIP150Block:             big.NewInt(0),
+		EIP155Block:             big.NewInt(0),
+		EIP158Block:             big.NewInt(0),
+		ByzantiumBlock:          big.NewInt(0),
+		ConstantinopleBlock:     big.NewInt(0),
+		PetersburgBlock:         big.NewInt(0),
+		IstanbulBlock:           big.NewInt(0),
+		MuirGlacierBlock:        big.NewInt(0),
+		BerlinBlock:             big.NewInt(0),
+		LondonBlock:             big.NewInt(0),
+		ArrowGlacierBlock:       big.NewInt(0),
+		MergeNetsplitBlock:      big.NewInt(0),
+		TerminalTotalDifficulty: big.NewInt(0),
+		ShanghaiTime:            u64(0),
+		CancunTime:              u64(0),
+		PragueTime:              u64(0),
+		OsakaTime:               u64(0),
+		BPO1Time:                u64(0),
+		BPO2Time:                u64(0),
+		DepositContractAddress:  params.MainnetChainConfig.DepositContractAddress,
+		BlobScheduleConfig: &params.BlobScheduleConfig{
+			Cancun: params.DefaultCancunBlobConfig,
+			Prague: params.DefaultPragueBlobConfig,
+			Osaka:  params.DefaultOsakaBlobConfig,
+			BPO1:   params.DefaultBPO1BlobConfig,
+			BPO2:   params.DefaultBPO2BlobConfig,
+		},
+	},
+	"BPO1ToBPO2AtTime15k": {
+		ChainID:                 big.NewInt(1),
+		HomesteadBlock:          big.NewInt(0),
+		EIP150Block:             big.NewInt(0),
+		EIP155Block:             big.NewInt(0),
+		EIP158Block:             big.NewInt(0),
+		ByzantiumBlock:          big.NewInt(0),
+		ConstantinopleBlock:     big.NewInt(0),
+		PetersburgBlock:         big.NewInt(0),
+		IstanbulBlock:           big.NewInt(0),
+		MuirGlacierBlock:        big.NewInt(0),
+		BerlinBlock:             big.NewInt(0),
+		LondonBlock:             big.NewInt(0),
+		ArrowGlacierBlock:       big.NewInt(0),
+		MergeNetsplitBlock:      big.NewInt(0),
+		TerminalTotalDifficulty: big.NewInt(0),
+		ShanghaiTime:            u64(0),
+		CancunTime:              u64(0),
+		PragueTime:              u64(0),
+		OsakaTime:               u64(0),
+		BPO1Time:                u64(0),
+		BPO2Time:                u64(15_000),
+		DepositContractAddress:  params.MainnetChainConfig.DepositContractAddress,
+		BlobScheduleConfig: &params.BlobScheduleConfig{
+			Cancun: params.DefaultCancunBlobConfig,
+			Prague: params.DefaultPragueBlobConfig,
+			Osaka:  params.DefaultOsakaBlobConfig,
+			BPO1:   params.DefaultBPO1BlobConfig,
+			BPO2:   params.DefaultBPO2BlobConfig,
+		},
+	},
+	"BPO3": {
+		ChainID:                 big.NewInt(1),
+		HomesteadBlock:          big.NewInt(0),
+		EIP150Block:             big.NewInt(0),
+		EIP155Block:             big.NewInt(0),
+		EIP158Block:             big.NewInt(0),
+		ByzantiumBlock:          big.NewInt(0),
+		ConstantinopleBlock:     big.NewInt(0),
+		PetersburgBlock:         big.NewInt(0),
+		IstanbulBlock:           big.NewInt(0),
+		MuirGlacierBlock:        big.NewInt(0),
+		BerlinBlock:             big.NewInt(0),
+		LondonBlock:             big.NewInt(0),
+		ArrowGlacierBlock:       big.NewInt(0),
+		MergeNetsplitBlock:      big.NewInt(0),
+		TerminalTotalDifficulty: big.NewInt(0),
+		ShanghaiTime:            u64(0),
+		CancunTime:              u64(0),
+		PragueTime:              u64(0),
+		OsakaTime:               u64(0),
+		BPO1Time:                u64(0),
+		BPO2Time:                u64(0),
+		BPO3Time:                u64(0),
+		DepositContractAddress:  params.MainnetChainConfig.DepositContractAddress,
+		BlobScheduleConfig: &params.BlobScheduleConfig{
+			Cancun: params.DefaultCancunBlobConfig,
+			Prague: params.DefaultPragueBlobConfig,
+			Osaka:  params.DefaultOsakaBlobConfig,
+			BPO1:   params.DefaultBPO1BlobConfig,
+			BPO2:   params.DefaultBPO2BlobConfig,
+			BPO3:   params.DefaultBPO3BlobConfig,
+		},
+	},
+	"BPO2ToBPO3AtTime15k": {
+		ChainID:                 big.NewInt(1),
+		HomesteadBlock:          big.NewInt(0),
+		EIP150Block:             big.NewInt(0),
+		EIP155Block:             big.NewInt(0),
+		EIP158Block:             big.NewInt(0),
+		ByzantiumBlock:          big.NewInt(0),
+		ConstantinopleBlock:     big.NewInt(0),
+		PetersburgBlock:         big.NewInt(0),
+		IstanbulBlock:           big.NewInt(0),
+		MuirGlacierBlock:        big.NewInt(0),
+		BerlinBlock:             big.NewInt(0),
+		LondonBlock:             big.NewInt(0),
+		ArrowGlacierBlock:       big.NewInt(0),
+		MergeNetsplitBlock:      big.NewInt(0),
+		TerminalTotalDifficulty: big.NewInt(0),
+		ShanghaiTime:            u64(0),
+		CancunTime:              u64(0),
+		PragueTime:              u64(0),
+		OsakaTime:               u64(0),
+		BPO1Time:                u64(0),
+		BPO2Time:                u64(0),
+		BPO3Time:                u64(15_000),
+		DepositContractAddress:  params.MainnetChainConfig.DepositContractAddress,
+		BlobScheduleConfig: &params.BlobScheduleConfig{
+			Cancun: params.DefaultCancunBlobConfig,
+			Prague: params.DefaultPragueBlobConfig,
+			Osaka:  params.DefaultOsakaBlobConfig,
+			BPO1:   params.DefaultBPO1BlobConfig,
+			BPO2:   params.DefaultBPO2BlobConfig,
+			BPO3:   params.DefaultBPO3BlobConfig,
+		},
+	},
+	"BPO4": {
+		ChainID:                 big.NewInt(1),
+		HomesteadBlock:          big.NewInt(0),
+		EIP150Block:             big.NewInt(0),
+		EIP155Block:             big.NewInt(0),
+		EIP158Block:             big.NewInt(0),
+		ByzantiumBlock:          big.NewInt(0),
+		ConstantinopleBlock:     big.NewInt(0),
+		PetersburgBlock:         big.NewInt(0),
+		IstanbulBlock:           big.NewInt(0),
+		MuirGlacierBlock:        big.NewInt(0),
+		BerlinBlock:             big.NewInt(0),
+		LondonBlock:             big.NewInt(0),
+		ArrowGlacierBlock:       big.NewInt(0),
+		MergeNetsplitBlock:      big.NewInt(0),
+		TerminalTotalDifficulty: big.NewInt(0),
+		ShanghaiTime:            u64(0),
+		CancunTime:              u64(0),
+		PragueTime:              u64(0),
+		OsakaTime:               u64(0),
+		BPO1Time:                u64(0),
+		BPO2Time:                u64(0),
+		BPO3Time:                u64(0),
+		BPO4Time:                u64(0),
+		DepositContractAddress:  params.MainnetChainConfig.DepositContractAddress,
+		BlobScheduleConfig: &params.BlobScheduleConfig{
+			Cancun: params.DefaultCancunBlobConfig,
+			Prague: params.DefaultPragueBlobConfig,
+			Osaka:  params.DefaultOsakaBlobConfig,
+			BPO1:   params.DefaultBPO1BlobConfig,
+			BPO2:   params.DefaultBPO2BlobConfig,
+			BPO3:   params.DefaultBPO3BlobConfig,
+			BPO4:   params.DefaultBPO4BlobConfig,
+		},
+	},
+	"BPO3ToBPO4AtTime15k": {
+		ChainID:                 big.NewInt(1),
+		HomesteadBlock:          big.NewInt(0),
+		EIP150Block:             big.NewInt(0),
+		EIP155Block:             big.NewInt(0),
+		EIP158Block:             big.NewInt(0),
+		ByzantiumBlock:          big.NewInt(0),
+		ConstantinopleBlock:     big.NewInt(0),
+		PetersburgBlock:         big.NewInt(0),
+		IstanbulBlock:           big.NewInt(0),
+		MuirGlacierBlock:        big.NewInt(0),
+		BerlinBlock:             big.NewInt(0),
+		LondonBlock:             big.NewInt(0),
+		ArrowGlacierBlock:       big.NewInt(0),
+		MergeNetsplitBlock:      big.NewInt(0),
+		TerminalTotalDifficulty: big.NewInt(0),
+		ShanghaiTime:            u64(0),
+		CancunTime:              u64(0),
+		PragueTime:              u64(0),
+		OsakaTime:               u64(0),
+		BPO1Time:                u64(0),
+		BPO2Time:                u64(0),
+		BPO3Time:                u64(0),
+		BPO4Time:                u64(15_000),
+		DepositContractAddress:  params.MainnetChainConfig.DepositContractAddress,
+		BlobScheduleConfig: &params.BlobScheduleConfig{
+			Cancun: params.DefaultCancunBlobConfig,
+			Prague: params.DefaultPragueBlobConfig,
+			Osaka:  params.DefaultOsakaBlobConfig,
+			BPO1:   params.DefaultBPO1BlobConfig,
+			BPO2:   params.DefaultBPO2BlobConfig,
+			BPO3:   params.DefaultBPO3BlobConfig,
+			BPO4:   params.DefaultBPO4BlobConfig,
+		},
+	},
 }
 
 // AvailableForks returns the set of defined fork names
diff --git a/tests/transaction_test.go b/tests/transaction_test.go
index 6260df0f3f..73ee3aa16a 100644
--- a/tests/transaction_test.go
+++ b/tests/transaction_test.go
@@ -70,7 +70,7 @@ func TestExecutionSpecTransaction(t *testing.T) {
 	st := new(testMatcher)
 
 	// Emptiness of authorization list is only validated during the tx precheck
-	st.skipLoad("^prague/eip7702_set_code_tx/invalid_tx/empty_authorization_list.json")
+	st.skipLoad("^prague/eip7702_set_code_tx/test_empty_authorization_list.json")
 
 	st.walk(t, executionSpecTransactionTestDir, func(t *testing.T, name string, test *TransactionTest) {
 		if err := st.checkFailure(t, test.Run()); err != nil {