diff --git a/builder/files/genesys-testnet-v4.json b/builder/files/genesis-testnet-v4.json
similarity index 99%
rename from builder/files/genesys-testnet-v4.json
rename to builder/files/genesis-testnet-v4.json
index 1d68659bdc..fa416cfbd0 100644
--- a/builder/files/genesys-testnet-v4.json
+++ b/builder/files/genesis-testnet-v4.json
@@ -16,12 +16,15 @@
     "bor": {
       "jaipurBlock": 22770000,
       "period": {
-        "0": 2
+        "0": 2,
+        "25275000": 5
+
       },
       "producerDelay": 6,
       "sprint": 64,
       "backupMultiplier": {
-        "0": 2
+        "0": 2,
+        "25275000": 5
       },
       "validatorContract": "0x0000000000000000000000000000000000001000",
       "stateReceiverContract": "0x0000000000000000000000000000000000001001",
diff --git a/internal/cli/server/chains/mumbai.go b/internal/cli/server/chains/mumbai.go
index 4d250dbf2b..1343230b95 100644
--- a/internal/cli/server/chains/mumbai.go
+++ b/internal/cli/server/chains/mumbai.go
@@ -31,12 +31,14 @@ var mumbaiTestnet = &Chain{
 			Bor: &params.BorConfig{
 				JaipurBlock: 22770000,
 				Period: map[string]uint64{
-					"0": 2,
+					"0":        2,
+					"25275000": 5,
 				},
 				ProducerDelay: 6,
 				Sprint:        64,
 				BackupMultiplier: map[string]uint64{
-					"0": 2,
+					"0":        2,
+					"25275000": 5,
 				},
 				ValidatorContract:     "0x0000000000000000000000000000000000001000",
 				StateReceiverContract: "0x0000000000000000000000000000000000001001",
diff --git a/params/config.go b/params/config.go
index 3bcee76982..dd4b39f7a4 100644
--- a/params/config.go
+++ b/params/config.go
@@ -278,12 +278,14 @@ var (
 		Bor: &BorConfig{
 			JaipurBlock: 22770000,
 			Period: map[string]uint64{
-				"0": 2,
+				"0":        2,
+				"25275000": 5,
 			},
 			ProducerDelay: 6,
 			Sprint:        64,
 			BackupMultiplier: map[string]uint64{
-				"0": 2,
+				"0":        2,
+				"25275000": 5,
 			},
 			ValidatorContract:     "0x0000000000000000000000000000000000001000",
 			StateReceiverContract: "0x0000000000000000000000000000000000001001",