diff --git a/op/katana/mainnet/genesis.json b/op/katana/mainnet/genesis.json
index 0fe6c913..a5662b3d 100644
--- a/op/katana/mainnet/genesis.json
+++ b/op/katana/mainnet/genesis.json
@@ -28,6 +28,7 @@
     "pragueTime": 1746806401,
     "osakaTime": 1773066601,
     "jovianTime": 1773066601,
+    "karstTime": 1790179201,
     "terminalTotalDifficulty": 0,
     "terminalTotalDifficultyPassed": true,
     "depositContractAddress": "0x0000000000000000000000000000000000000000",
diff --git a/op/katana/mainnet/rollup.json b/op/katana/mainnet/rollup.json
index 2e0278de..aae75430 100644
--- a/op/katana/mainnet/rollup.json
+++ b/op/katana/mainnet/rollup.json
@@ -32,6 +32,7 @@
   "holocene_time": 0,
   "isthmus_time": 1746806401,
   "jovian_time": 1773066601,
+  "karst_time": 1790179201,
   "batch_inbox_address": "0x000d4411cdeb152378626b5c5e33fd5d6808939a",
   "deposit_contract_address": "0x250d30c523104bf0a06825e7eade4dc46edfe40e",
   "l1_system_config_address": "0xb6e1f8b589a14b79ddd3ad7f0589ab548c70c174",