diff --git a/src/Nethermind/Chains/worldchain-mainnet.json b/src/Nethermind/Chains/worldchain-mainnet.json
index 9c3f33e6d2f..669f79683e1 100644
--- a/src/Nethermind/Chains/worldchain-mainnet.json
+++ b/src/Nethermind/Chains/worldchain-mainnet.json
@@ -1,6 +1,6 @@
 {
-  "name": "Op Sepolia",
-  "dataDir": "op-sepolia",
+  "name": "Worldchain Mainnet",
+  "dataDir": "worldchain-mainnet",
   "engine": {
     "Optimism": {
       "params": {
@@ -10,6 +10,7 @@
         "ecotoneTimestamp": "0x0",
         "fjordTimestamp": "0x66a0fad0",
         "graniteTimestamp": "0x66FBD630",
+        "holoceneTimestamp": "0x679b69c0",
         "l1FeeRecipient": "0x420000000000000000000000000000000000001A",
         "l1BlockAddress": "0x4200000000000000000000000000000000000015",
         "canyonBaseFeeChangeDenominator": "250",
@@ -66,6 +67,7 @@
     "eip6780TransitionTimestamp": "0x0",
     "rip7212TransitionTimestamp": "0x66a0fad0",
     "opGraniteTransitionTimestamp": "0x66fbd630",
+    "opHoloceneTransitionTimestamp": "0x679b69c0",
     "terminalTotalDifficulty": "0"
   },
   "genesis": {
diff --git a/src/Nethermind/Chains/worldchain-sepolia.json b/src/Nethermind/Chains/worldchain-sepolia.json
index 54a76daa33e..21c67b97548 100644
--- a/src/Nethermind/Chains/worldchain-sepolia.json
+++ b/src/Nethermind/Chains/worldchain-sepolia.json
@@ -1,6 +1,6 @@
 {
-  "name": "Op Sepolia",
-  "dataDir": "op-sepolia",
+  "name": "Worldchain Sepolia",
+  "dataDir": "worldchain-sepolia",
   "engine": {
     "Optimism": {
       "params": {
@@ -10,6 +10,7 @@
         "ecotoneTimestamp": "0x0",
         "fjordTimestamp": "0x669fa950",
         "graniteTimestamp": "0x66e96130",
+        "holoceneTimestamp": "0x67922f40",
         "l1FeeRecipient": "0x420000000000000000000000000000000000001A",
         "l1BlockAddress": "0x4200000000000000000000000000000000000015",
         "canyonBaseFeeChangeDenominator": "250",
@@ -66,6 +67,7 @@
     "eip6780TransitionTimestamp": "0x0",
     "rip7212TransitionTimestamp": "0x669fa950",
     "opGraniteTransitionTimestamp": "0x66e96130",
+    "opHoloceneTransitionTimestamp": "0x67922f40",
     "terminalTotalDifficulty": "0"
   },
   "genesis": {