diff --git a/op/hashkeychain/mainnet/genesis.json b/op/hashkeychain/mainnet/genesis.json
index f58bb112..1bfbb06f 100644
--- a/op/hashkeychain/mainnet/genesis.json
+++ b/op/hashkeychain/mainnet/genesis.json
@@ -25,6 +25,7 @@
     "graniteTime": 0,
     "holoceneTime": 1785306600,
     "isthmusTime": 1785306900,
+    "pragueTime": 1785306900,
     "jovianTime": 1785307200,
     "terminalTotalDifficulty": 0,
     "terminalTotalDifficultyPassed": true,