diff --git a/common/eth2_network_config/built_in_network_configs/sepolia/config.yaml b/common/eth2_network_config/built_in_network_configs/sepolia/config.yaml
index 95587c2908..4c3e4bb6ec 100644
--- a/common/eth2_network_config/built_in_network_configs/sepolia/config.yaml
+++ b/common/eth2_network_config/built_in_network_configs/sepolia/config.yaml
@@ -24,7 +24,7 @@ ALTAIR_FORK_EPOCH: 50
 # Merge
 BELLATRIX_FORK_VERSION: 0x90000071
 BELLATRIX_FORK_EPOCH: 100
-TERMINAL_TOTAL_DIFFICULTY: 100000000000000000000000
+TERMINAL_TOTAL_DIFFICULTY: 17000000000000000
 TERMINAL_BLOCK_HASH: 0x0000000000000000000000000000000000000000000000000000000000000000
 TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH: 18446744073709551615