diff --git a/configs/mainnet.yaml b/configs/mainnet.yaml
index deb3dcf5fe..d69d7c50d8 100644
--- a/configs/mainnet.yaml
+++ b/configs/mainnet.yaml
@@ -14,9 +14,9 @@ CONFIG_NAME: 'mainnet'
 # ---------------------------------------------------------------
 # Estimated on Sept 15, 2022
 TERMINAL_TOTAL_DIFFICULTY: 58750000000000000000000
-# By default, don't use these params
-TERMINAL_BLOCK_HASH: 0x0000000000000000000000000000000000000000000000000000000000000000
-TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH: 18446744073709551615
+# Hardcoded on deprecation of TTD
+TERMINAL_BLOCK_HASH: 0x55b11b918355b1ef9c5db810302ebad0bf2544255b530cdce90674d5887bb286
+TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH: 146875