diff --git a/builder/files/genesis-testnet-v4.json b/builder/files/genesis-testnet-v4.json
index 52ac2645f7..41c6b072d1 100644
--- a/builder/files/genesis-testnet-v4.json
+++ b/builder/files/genesis-testnet-v4.json
@@ -18,7 +18,8 @@
       "delhiBlock":  29389056,
       "period": {
         "0": 2,
-        "25275000": 5
+        "25275000": 5,
+        "29389056": 2
       },
       "producerDelay": {
         "0": 6,
@@ -30,7 +31,8 @@
       },
       "backupMultiplier": {
         "0": 2,
-        "25275000": 5
+        "25275000": 5,
+        "29389056": 2
       },
       "validatorContract": "0x0000000000000000000000000000000000001000",
       "stateReceiverContract": "0x0000000000000000000000000000000000001001",
diff --git a/internal/cli/server/chains/mumbai.go b/internal/cli/server/chains/mumbai.go
index e195f5e584..daa4a2bea7 100644
--- a/internal/cli/server/chains/mumbai.go
+++ b/internal/cli/server/chains/mumbai.go
@@ -34,6 +34,7 @@ var mumbaiTestnet = &Chain{
 				Period: map[string]uint64{
 					"0":        2,
 					"25275000": 5,
+					"29389056": 2,
 				},
 				ProducerDelay: map[string]uint64{
 					"0":        6,
@@ -46,6 +47,7 @@ var mumbaiTestnet = &Chain{
 				BackupMultiplier: map[string]uint64{
 					"0":        2,
 					"25275000": 5,
+					"29389056": 2,
 				},
 				ValidatorContract:     "0x0000000000000000000000000000000000001000",
 				StateReceiverContract: "0x0000000000000000000000000000000000001001",
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 bdea670388..785c8cf855 100644
--- a/internal/cli/server/chains/test_files/chain_legacy_test.json
+++ b/internal/cli/server/chains/test_files/chain_legacy_test.json
@@ -16,7 +16,9 @@
     "londonBlock": 13996000,
     "bor": {
       "period": {
-        "0": 2
+        "0": 2,
+        "25275000": 5,
+        "29389056": 2
       },
       "producerDelay": {
         "0": 6,
@@ -27,7 +29,9 @@
         "29389056": 16
       },
       "backupMultiplier": {
-        "0": 2
+        "0": 2,
+        "25275000": 5,
+        "29389056": 2
       },
       "validatorContract": "0x0000000000000000000000000000000000001000",
       "stateReceiverContract": "0x0000000000000000000000000000000000001001",
diff --git a/internal/cli/server/chains/test_files/chain_test.json b/internal/cli/server/chains/test_files/chain_test.json
index 8f61363a9b..37b0131fbf 100644
--- a/internal/cli/server/chains/test_files/chain_test.json
+++ b/internal/cli/server/chains/test_files/chain_test.json
@@ -18,7 +18,9 @@
         "londonBlock":13996000,
         "bor":{
           "period":{
-            "0":2
+            "0":2,
+            "25275000": 5,
+            "29389056": 2
           },
           "producerDelay":{
             "0": 6,
@@ -29,7 +31,9 @@
             "29389056": 16
           },
           "backupMultiplier":{
-            "0":2
+            "0": 2,
+            "25275000": 5,
+            "29389056": 2
           },
           "validatorContract":"0x0000000000000000000000000000000000001000",
           "stateReceiverContract":"0x0000000000000000000000000000000000001001",
diff --git a/params/config.go b/params/config.go
index 05e8187b41..92473b1146 100644
--- a/params/config.go
+++ b/params/config.go
@@ -354,6 +354,7 @@ var (
 			Period: map[string]uint64{
 				"0":        2,
 				"25275000": 5,
+				"29389056": 2,
 			},
 			ProducerDelay: map[string]uint64{
 				"0":        6,
@@ -366,6 +367,7 @@ var (
 			BackupMultiplier: map[string]uint64{
 				"0":        2,
 				"25275000": 5,
+				"29389056": 2,
 			},
 			ValidatorContract:     "0x0000000000000000000000000000000000001000",
 			StateReceiverContract: "0x0000000000000000000000000000000000001001",