diff --git a/op/mode/mainnet/genesis.json b/op/mode/mainnet/genesis.json
index bc94f585..9ddc1b9e 100644
--- a/op/mode/mainnet/genesis.json
+++ b/op/mode/mainnet/genesis.json
@@ -31,7 +31,8 @@
     "terminalTotalDifficultyPassed": true,
     "optimism": {
       "eip1559Elasticity": 6,
-      "eip1559Denominator": 50
+      "eip1559Denominator": 50,
+      "eip1559DenominatorCanyon": 250
     }
   },
   "nonce": "0x0",