diff --git a/builder/files/genesis-mainnet-v1.json b/builder/files/genesis-mainnet-v1.json
index d3f0d02206..a5b96140ca 100644
--- a/builder/files/genesis-mainnet-v1.json
+++ b/builder/files/genesis-mainnet-v1.json
@@ -15,14 +15,17 @@
     "londonBlock": 23850000,
     "bor": {
       "jaipurBlock": 23850000,
+      "delhiBlock":  36499456,
       "period": {
         "0": 2
       },
       "producerDelay": {
-        "0": 6
+        "0": 6,
+        "36499456": 4
       },
       "sprint": {
-        "0": 64
+        "0": 64,
+        "36499456": 16
       },
       "backupMultiplier": {
         "0": 2
diff --git a/builder/files/genesis-testnet-v4.json b/builder/files/genesis-testnet-v4.json
index 8a0af45088..52ac2645f7 100644
--- a/builder/files/genesis-testnet-v4.json
+++ b/builder/files/genesis-testnet-v4.json
@@ -15,15 +15,18 @@
     "londonBlock": 22640000,
     "bor": {
       "jaipurBlock": 22770000,
+      "delhiBlock":  29389056,
       "period": {
         "0": 2,
         "25275000": 5
       },
       "producerDelay": {
-        "0": 6
+        "0": 6,
+        "29389056": 4
       },
       "sprint": {
-        "0": 64
+        "0": 64,
+        "29389056": 16
       },
       "backupMultiplier": {
         "0": 2,
diff --git a/consensus/bor/bor.go b/consensus/bor/bor.go
index 3cc8c68ec2..1b4ddec45d 100644
--- a/consensus/bor/bor.go
+++ b/consensus/bor/bor.go
@@ -169,7 +169,7 @@ func encodeSigHeader(w io.Writer, header *types.Header, c *params.BorConfig) {
 		header.Nonce,
 	}
 
-	if c.IsJaipur(header.Number.Uint64()) {
+	if c.IsJaipur(header.Number) {
 		if header.BaseFee != nil {
 			enc = append(enc, header.BaseFee)
 		}
diff --git a/consensus/bor/bor_test.go b/consensus/bor/bor_test.go
index fc2d59520d..9ca361a18d 100644
--- a/consensus/bor/bor_test.go
+++ b/consensus/bor/bor_test.go
@@ -125,20 +125,20 @@ func TestEncodeSigHeaderJaipur(t *testing.T) {
 	)
 
 	// Jaipur NOT enabled and BaseFee not set
-	hash := SealHash(h, &params.BorConfig{JaipurBlock: 10})
+	hash := SealHash(h, &params.BorConfig{JaipurBlock: big.NewInt(10)})
 	require.Equal(t, hash, hashWithoutBaseFee)
 
 	// Jaipur enabled (Jaipur=0) and BaseFee not set
-	hash = SealHash(h, &params.BorConfig{JaipurBlock: 0})
+	hash = SealHash(h, &params.BorConfig{JaipurBlock: common.Big0})
 	require.Equal(t, hash, hashWithoutBaseFee)
 
 	h.BaseFee = big.NewInt(2)
 
 	// Jaipur enabled (Jaipur=Header block) and BaseFee set
-	hash = SealHash(h, &params.BorConfig{JaipurBlock: 1})
+	hash = SealHash(h, &params.BorConfig{JaipurBlock: common.Big1})
 	require.Equal(t, hash, hashWithBaseFee)
 
 	// Jaipur NOT enabled and BaseFee set
-	hash = SealHash(h, &params.BorConfig{JaipurBlock: 10})
+	hash = SealHash(h, &params.BorConfig{JaipurBlock: big.NewInt(10)})
 	require.Equal(t, hash, hashWithoutBaseFee)
 }
diff --git a/consensus/misc/eip1559.go b/consensus/misc/eip1559.go
index 8fca0fdc70..193a5b84e2 100644
--- a/consensus/misc/eip1559.go
+++ b/consensus/misc/eip1559.go
@@ -59,9 +59,10 @@ func CalcBaseFee(config *params.ChainConfig, parent *types.Header) *big.Int {
 	}
 
 	var (
-		parentGasTarget          = parent.GasLimit / params.ElasticityMultiplier
-		parentGasTargetBig       = new(big.Int).SetUint64(parentGasTarget)
-		baseFeeChangeDenominator = new(big.Int).SetUint64(params.BaseFeeChangeDenominator)
+		parentGasTarget                = parent.GasLimit / params.ElasticityMultiplier
+		parentGasTargetBig             = new(big.Int).SetUint64(parentGasTarget)
+		baseFeeChangeDenominatorUint64 = params.BaseFeeChangeDenominator(config.Bor, parent.Number)
+		baseFeeChangeDenominator       = new(big.Int).SetUint64(baseFeeChangeDenominatorUint64)
 	)
 	// If the parent gasUsed is the same as the target, the baseFee remains unchanged.
 	if parent.GasUsed == parentGasTarget {
diff --git a/consensus/misc/eip1559_test.go b/consensus/misc/eip1559_test.go
index 23cd9023de..aba95d8005 100644
--- a/consensus/misc/eip1559_test.go
+++ b/consensus/misc/eip1559_test.go
@@ -20,7 +20,6 @@ import (
 	"math/big"
 	"testing"
 
-	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/params"
 )
@@ -47,12 +46,14 @@ func copyConfig(original *params.ChainConfig) *params.ChainConfig {
 		TerminalTotalDifficulty: original.TerminalTotalDifficulty,
 		Ethash:                  original.Ethash,
 		Clique:                  original.Clique,
+		Bor:                     original.Bor,
 	}
 }
 
 func config() *params.ChainConfig {
 	config := copyConfig(params.TestChainConfig)
 	config.LondonBlock = big.NewInt(5)
+	config.Bor.DelhiBlock = big.NewInt(8)
 	return config
 }
 
@@ -108,6 +109,8 @@ func TestBlockGasLimits(t *testing.T) {
 
 // TestCalcBaseFee assumes all blocks are 1559-blocks
 func TestCalcBaseFee(t *testing.T) {
+	t.Parallel()
+
 	tests := []struct {
 		parentBaseFee   int64
 		parentGasLimit  uint64
@@ -117,10 +120,12 @@ func TestCalcBaseFee(t *testing.T) {
 		{params.InitialBaseFee, 20000000, 10000000, params.InitialBaseFee}, // usage == target
 		{params.InitialBaseFee, 20000000, 9000000, 987500000},              // usage below target
 		{params.InitialBaseFee, 20000000, 11000000, 1012500000},            // usage above target
+		{params.InitialBaseFee, 20000000, 20000000, 1125000000},            // usage full
+		{params.InitialBaseFee, 20000000, 0, 875000000},                    // usage 0
 	}
 	for i, test := range tests {
 		parent := &types.Header{
-			Number:   common.Big32,
+			Number:   big.NewInt(6),
 			GasLimit: test.parentGasLimit,
 			GasUsed:  test.parentGasUsed,
 			BaseFee:  big.NewInt(test.parentBaseFee),
@@ -130,3 +135,38 @@ func TestCalcBaseFee(t *testing.T) {
 		}
 	}
 }
+
+// TestCalcBaseFee assumes all blocks are 1559-blocks post Delhi Hard Fork
+func TestCalcBaseFeeDelhi(t *testing.T) {
+	t.Parallel()
+
+	testConfig := copyConfig(config())
+
+	// Test Delhi Hard Fork
+	// Hard fork kicks in at block 8
+
+	tests := []struct {
+		parentBaseFee   int64
+		parentGasLimit  uint64
+		parentGasUsed   uint64
+		expectedBaseFee int64
+	}{
+		{params.InitialBaseFee, 20000000, 10000000, params.InitialBaseFee}, // usage == target
+		{params.InitialBaseFee, 20000000, 9000000, 993750000},              // usage below target
+		{params.InitialBaseFee, 20000000, 11000000, 1006250000},            // usage above target
+		{params.InitialBaseFee, 20000000, 20000000, 1062500000},            // usage full
+		{params.InitialBaseFee, 20000000, 0, 937500000},                    // usage 0
+
+	}
+	for i, test := range tests {
+		parent := &types.Header{
+			Number:   big.NewInt(8),
+			GasLimit: test.parentGasLimit,
+			GasUsed:  test.parentGasUsed,
+			BaseFee:  big.NewInt(test.parentBaseFee),
+		}
+		if have, want := CalcBaseFee(testConfig, parent), big.NewInt(test.expectedBaseFee); have.Cmp(want) != 0 {
+			t.Errorf("test %d: have %d  want %d, ", i, have, want)
+		}
+	}
+}
diff --git a/internal/cli/server/chains/mainnet.go b/internal/cli/server/chains/mainnet.go
index 20ff8bc9f2..8b75039f1a 100644
--- a/internal/cli/server/chains/mainnet.go
+++ b/internal/cli/server/chains/mainnet.go
@@ -29,15 +29,18 @@ var mainnetBor = &Chain{
 			BerlinBlock:         big.NewInt(14750000),
 			LondonBlock:         big.NewInt(23850000),
 			Bor: &params.BorConfig{
-				JaipurBlock: 23850000,
+				JaipurBlock: big.NewInt(23850000),
+				DelhiBlock:  big.NewInt(36499456),
 				Period: map[string]uint64{
 					"0": 2,
 				},
 				ProducerDelay: map[string]uint64{
-					"0": 6,
+					"0":        6,
+					"36499456": 4,
 				},
 				Sprint: map[string]uint64{
-					"0": 64,
+					"0":        64,
+					"36499456": 16,
 				},
 				BackupMultiplier: map[string]uint64{
 					"0": 2,
diff --git a/internal/cli/server/chains/mumbai.go b/internal/cli/server/chains/mumbai.go
index 9015e1b82b..e195f5e584 100644
--- a/internal/cli/server/chains/mumbai.go
+++ b/internal/cli/server/chains/mumbai.go
@@ -29,16 +29,19 @@ var mumbaiTestnet = &Chain{
 			BerlinBlock:         big.NewInt(13996000),
 			LondonBlock:         big.NewInt(22640000),
 			Bor: &params.BorConfig{
-				JaipurBlock: 22770000,
+				JaipurBlock: big.NewInt(22770000),
+				DelhiBlock:  big.NewInt(29389056),
 				Period: map[string]uint64{
 					"0":        2,
 					"25275000": 5,
 				},
 				ProducerDelay: map[string]uint64{
-					"0": 6,
+					"0":        6,
+					"29389056": 4,
 				},
 				Sprint: map[string]uint64{
-					"0": 64,
+					"0":        64,
+					"29389056": 16,
 				},
 				BackupMultiplier: map[string]uint64{
 					"0":        2,
diff --git a/internal/cli/server/chains/test_files/chain_legacy_test.json b/internal/cli/server/chains/test_files/chain_legacy_test.json
index 69702c6ad6..bdea670388 100644
--- a/internal/cli/server/chains/test_files/chain_legacy_test.json
+++ b/internal/cli/server/chains/test_files/chain_legacy_test.json
@@ -19,10 +19,12 @@
         "0": 2
       },
       "producerDelay": {
-        "0": 6
+        "0": 6,
+        "29389056": 4
       },
       "sprint": {
-        "0": 64
+        "0": 64,
+        "29389056": 16
       },
       "backupMultiplier": {
         "0": 2
@@ -41,7 +43,8 @@
       "burntContract": {
         "22640000": "0x70bcA57F4579f58670aB2d18Ef16e02C17553C38"
       },
-      "jaipurBlock": 22770000
+      "jaipurBlock": 22770000,
+      "delhiBlock": 29389056
     }
   },
   "nonce": "0x0",
diff --git a/internal/cli/server/chains/test_files/chain_test.json b/internal/cli/server/chains/test_files/chain_test.json
index c8d9f6f4f8..8f61363a9b 100644
--- a/internal/cli/server/chains/test_files/chain_test.json
+++ b/internal/cli/server/chains/test_files/chain_test.json
@@ -21,10 +21,12 @@
             "0":2
           },
           "producerDelay":{
-            "0": 6
+            "0": 6,
+            "29389056": 4
           },
           "sprint":{
-            "0": 64
+            "0": 64,
+            "29389056": 16
           },
           "backupMultiplier":{
             "0":2
@@ -43,7 +45,8 @@
           "burntContract":{
             "22640000":"0x70bcA57F4579f58670aB2d18Ef16e02C17553C38"
           },
-          "jaipurBlock":22770000
+          "jaipurBlock":22770000,
+          "delhiBlock": 29389056
         }
       },
       "nonce":"0x0",
diff --git a/params/config.go b/params/config.go
index fe17f31bb0..6fac0e5a07 100644
--- a/params/config.go
+++ b/params/config.go
@@ -349,16 +349,19 @@ var (
 		BerlinBlock:         big.NewInt(13996000),
 		LondonBlock:         big.NewInt(22640000),
 		Bor: &BorConfig{
-			JaipurBlock: 22770000,
+			JaipurBlock: big.NewInt(22770000),
+			DelhiBlock:  big.NewInt(29389056),
 			Period: map[string]uint64{
 				"0":        2,
 				"25275000": 5,
 			},
 			ProducerDelay: map[string]uint64{
-				"0": 6,
+				"0":        6,
+				"29389056": 4,
 			},
 			Sprint: map[string]uint64{
-				"0": 64,
+				"0":        64,
+				"29389056": 16,
 			},
 			BackupMultiplier: map[string]uint64{
 				"0":        2,
@@ -398,15 +401,18 @@ var (
 		BerlinBlock:         big.NewInt(14750000),
 		LondonBlock:         big.NewInt(23850000),
 		Bor: &BorConfig{
-			JaipurBlock: 23850000,
+			JaipurBlock: big.NewInt(23850000),
+			DelhiBlock:  big.NewInt(36499456),
 			Period: map[string]uint64{
 				"0": 2,
 			},
 			ProducerDelay: map[string]uint64{
-				"0": 6,
+				"0":        6,
+				"36499456": 4,
 			},
 			Sprint: map[string]uint64{
-				"0": 64,
+				"0":        64,
+				"36499456": 16,
 			},
 			BackupMultiplier: map[string]uint64{
 				"0": 2,
@@ -576,7 +582,8 @@ type BorConfig struct {
 	OverrideStateSyncRecords map[string]int         `json:"overrideStateSyncRecords"` // override state records count
 	BlockAlloc               map[string]interface{} `json:"blockAlloc"`
 	BurntContract            map[string]string      `json:"burntContract"` // governance contract where the token will be sent to and burnt in london fork
-	JaipurBlock              uint64                 `json:"jaipurBlock"`   // Jaipur switch block (nil = no fork, 0 = already on jaipur)
+	JaipurBlock              *big.Int               `json:"jaipurBlock"`   // Jaipur switch block (nil = no fork, 0 = already on jaipur)
+	DelhiBlock               *big.Int               `json:"delhiBlock"`    // Delhi switch block (nil = no fork, 0 = already on delhi)
 }
 
 // String implements the stringer interface, returning the consensus engine details.
@@ -600,8 +607,12 @@ func (c *BorConfig) CalculatePeriod(number uint64) uint64 {
 	return c.calculateBorConfigHelper(c.Period, number)
 }
 
-func (c *BorConfig) IsJaipur(number uint64) bool {
-	return number >= c.JaipurBlock
+func (c *BorConfig) IsJaipur(number *big.Int) bool {
+	return isForked(c.JaipurBlock, number)
+}
+
+func (c *BorConfig) IsDelhi(number *big.Int) bool {
+	return isForked(c.DelhiBlock, number)
 }
 
 func (c *BorConfig) calculateBorConfigHelper(field map[string]uint64, number uint64) uint64 {
diff --git a/params/protocol_params.go b/params/protocol_params.go
index 5f154597a7..d468af5d3c 100644
--- a/params/protocol_params.go
+++ b/params/protocol_params.go
@@ -119,9 +119,11 @@ const (
 	// Introduced in Tangerine Whistle (Eip 150)
 	CreateBySelfdestructGas uint64 = 25000
 
-	BaseFeeChangeDenominator = 8          // Bounds the amount the base fee can change between blocks.
-	ElasticityMultiplier     = 2          // Bounds the maximum gas limit an EIP-1559 block may have.
-	InitialBaseFee           = 1000000000 // Initial base fee for EIP-1559 blocks.
+	BaseFeeChangeDenominatorPreDelhi  = 8  // Bounds the amount the base fee can change between blocks before Delhi Hard Fork.
+	BaseFeeChangeDenominatorPostDelhi = 16 // Bounds the amount the base fee can change between blocks after Delhi Hard Fork.
+
+	ElasticityMultiplier = 2          // Bounds the maximum gas limit an EIP-1559 block may have.
+	InitialBaseFee       = 1000000000 // Initial base fee for EIP-1559 blocks.
 
 	MaxCodeSize = 24576 // Maximum bytecode to permit for a contract
 
@@ -168,3 +170,11 @@ var (
 	MinimumDifficulty      = big.NewInt(131072) // The minimum that the difficulty may ever be.
 	DurationLimit          = big.NewInt(13)     // The decision boundary on the blocktime duration used to determine whether difficulty should go up or not.
 )
+
+func BaseFeeChangeDenominator(borConfig *BorConfig, number *big.Int) uint64 {
+	if borConfig.IsDelhi(number) {
+		return BaseFeeChangeDenominatorPostDelhi
+	} else {
+		return BaseFeeChangeDenominatorPreDelhi
+	}
+}
diff --git a/tests/bor/bor_test.go b/tests/bor/bor_test.go
index 0b339b04d1..d059956e6a 100644
--- a/tests/bor/bor_test.go
+++ b/tests/bor/bor_test.go
@@ -1073,11 +1073,11 @@ func TestJaipurFork(t *testing.T) {
 		block = buildNextBlock(t, _bor, chain, block, nil, init.genesis.Config.Bor, nil, res.Result.ValidatorSet.Validators)
 		insertNewBlock(t, chain, block)
 
-		if block.Number().Uint64() == init.genesis.Config.Bor.JaipurBlock-1 {
+		if block.Number().Uint64() == init.genesis.Config.Bor.JaipurBlock.Uint64()-1 {
 			require.Equal(t, testSealHash(block.Header(), init.genesis.Config.Bor), bor.SealHash(block.Header(), init.genesis.Config.Bor))
 		}
 
-		if block.Number().Uint64() == init.genesis.Config.Bor.JaipurBlock {
+		if block.Number().Uint64() == init.genesis.Config.Bor.JaipurBlock.Uint64() {
 			require.Equal(t, testSealHash(block.Header(), init.genesis.Config.Bor), bor.SealHash(block.Header(), init.genesis.Config.Bor))
 		}
 	}
@@ -1109,7 +1109,7 @@ func testEncodeSigHeader(w io.Writer, header *types.Header, c *params.BorConfig)
 		header.MixDigest,
 		header.Nonce,
 	}
-	if c.IsJaipur(header.Number.Uint64()) {
+	if c.IsJaipur(header.Number) {
 		if header.BaseFee != nil {
 			enc = append(enc, header.BaseFee)
 		}
diff --git a/tests/bor/testdata/genesis.json b/tests/bor/testdata/genesis.json
index 87a7ea0b98..cbae055a0a 100644
--- a/tests/bor/testdata/genesis.json
+++ b/tests/bor/testdata/genesis.json
@@ -15,6 +15,7 @@
     "londonBlock": 1,
     "bor": {
       "jaipurBlock": 2,
+      "delhiBlock" :3,
       "period": {
         "0": 1
       },
diff --git a/tests/bor/testdata/genesis_21val.json b/tests/bor/testdata/genesis_21val.json
index 2f67e56073..e2c604b1dc 100644
--- a/tests/bor/testdata/genesis_21val.json
+++ b/tests/bor/testdata/genesis_21val.json
@@ -15,6 +15,7 @@
     "londonBlock": 0,
     "bor": {
       "jaipurBlock": 0,
+      "delhiBlock" :0,
       "period": {
         "0": 1
       },
diff --git a/tests/bor/testdata/genesis_2val.json b/tests/bor/testdata/genesis_2val.json
index 4ff647dde4..5ce5fbcd4e 100644
--- a/tests/bor/testdata/genesis_2val.json
+++ b/tests/bor/testdata/genesis_2val.json
@@ -15,6 +15,7 @@
       "londonBlock": 1,
       "bor": {
         "jaipurBlock": 2,
+        "delhiBlock" :3,
         "period": {
           "0": 1
         },
diff --git a/tests/bor/testdata/genesis_7val.json b/tests/bor/testdata/genesis_7val.json
index 7fd5d08057..97982a3deb 100644
--- a/tests/bor/testdata/genesis_7val.json
+++ b/tests/bor/testdata/genesis_7val.json
@@ -15,6 +15,7 @@
       "londonBlock": 0,
       "bor": {
         "jaipurBlock": 0,
+        "delhiBlock" :0,
         "period": {
           "0": 1
         },
diff --git a/tests/bor/testdata/genesis_sprint_length_change.json b/tests/bor/testdata/genesis_sprint_length_change.json
index ce6a2cb5f4..cb6eb2a729 100644
--- a/tests/bor/testdata/genesis_sprint_length_change.json
+++ b/tests/bor/testdata/genesis_sprint_length_change.json
@@ -15,6 +15,7 @@
       "londonBlock": 1,
       "bor": {
         "jaipurBlock": 2,
+        "delhiBlock" :3,
         "period": {
           "0": 1
         },