diff --git a/common/eth2_network_config/built_in_network_configs/gnosis/config.yaml b/common/eth2_network_config/built_in_network_configs/gnosis/config.yaml
index 7987899c3df..d55ef3f3b5f 100644
--- a/common/eth2_network_config/built_in_network_configs/gnosis/config.yaml
+++ b/common/eth2_network_config/built_in_network_configs/gnosis/config.yaml
@@ -6,8 +6,8 @@ PRESET_BASE: 'gnosis'
 
 # Transition
 # ---------------------------------------------------------------
-# TBD, 2**256-2**10 is a placeholder
-TERMINAL_TOTAL_DIFFICULTY: 115792089237316195423570985008687907853269984665640564039457584007913129638912
+# Estimated on Dec 5, 2022
+TERMINAL_TOTAL_DIFFICULTY: 8626000000000000000000058750000000000000000000
 # By default, don't use these params
 TERMINAL_BLOCK_HASH: 0x0000000000000000000000000000000000000000000000000000000000000000
 TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH: 18446744073709551615
@@ -35,7 +35,7 @@ ALTAIR_FORK_VERSION: 0x01000064
 ALTAIR_FORK_EPOCH: 512
 # Merge
 BELLATRIX_FORK_VERSION: 0x02000064
-BELLATRIX_FORK_EPOCH: 18446744073709551615
+BELLATRIX_FORK_EPOCH: 385536
 # Sharding
 SHARDING_FORK_VERSION: 0x03000064
 SHARDING_FORK_EPOCH: 18446744073709551615
diff --git a/common/eth2_network_config/src/lib.rs b/common/eth2_network_config/src/lib.rs
index 2bfd0032668..7aef784373d 100644
--- a/common/eth2_network_config/src/lib.rs
+++ b/common/eth2_network_config/src/lib.rs
@@ -226,7 +226,7 @@ mod tests {
     use super::*;
     use ssz::Encode;
     use tempfile::Builder as TempBuilder;
-    use types::{Config, Eth1Data, GnosisEthSpec, Hash256, MainnetEthSpec, GNOSIS};
+    use types::{Config, Eth1Data, GnosisEthSpec, Hash256, MainnetEthSpec};
 
     type E = MainnetEthSpec;
 
@@ -250,6 +250,13 @@ mod tests {
         assert_eq!(spec, config.chain_spec::<E>().unwrap());
     }
 
+    #[test]
+    fn gnosis_config_eq_chain_spec() {
+        let config = Eth2NetworkConfig::from_hardcoded_net(&GNOSIS).unwrap();
+        let spec = ChainSpec::gnosis();
+        assert_eq!(spec, config.chain_spec::<GnosisEthSpec>().unwrap());
+    }
+
     #[test]
     fn mainnet_genesis_state() {
         let config = Eth2NetworkConfig::from_hardcoded_net(&MAINNET).unwrap();
@@ -270,7 +277,7 @@ mod tests {
                 .unwrap_or_else(|_| panic!("{:?}", net.name));
 
             // Ensure we can parse the YAML config to a chain spec.
-            if net.name == GNOSIS {
+            if net.name == types::GNOSIS {
                 config.chain_spec::<GnosisEthSpec>().unwrap();
             } else {
                 config.chain_spec::<MainnetEthSpec>().unwrap();
diff --git a/consensus/types/src/chain_spec.rs b/consensus/types/src/chain_spec.rs
index f68e65d7d56..c8333868cd2 100644
--- a/consensus/types/src/chain_spec.rs
+++ b/consensus/types/src/chain_spec.rs
@@ -777,7 +777,7 @@ impl ChainSpec {
             domain_sync_committee_selection_proof: 8,
             domain_contribution_and_proof: 9,
             altair_fork_version: [0x01, 0x00, 0x00, 0x64],
-            altair_fork_epoch: Some(Epoch::new(256)),
+            altair_fork_epoch: Some(Epoch::new(512)),
 
             /*
              * Merge hard fork params
@@ -788,14 +788,11 @@ impl ChainSpec {
                 .expect("pow does not overflow"),
             proportional_slashing_multiplier_bellatrix: 3,
             bellatrix_fork_version: [0x02, 0x00, 0x00, 0x64],
-            bellatrix_fork_epoch: None,
-            terminal_total_difficulty: Uint256::MAX
-                .checked_sub(Uint256::from(2u64.pow(10)))
-                .expect("subtraction does not overflow")
-                // Add 1 since the spec declares `2**256 - 2**10` and we use
-                // `Uint256::MAX` which is `2*256- 1`.
-                .checked_add(Uint256::one())
-                .expect("addition does not overflow"),
+            bellatrix_fork_epoch: Some(Epoch::new(385536)),
+            terminal_total_difficulty: Uint256::from_dec_str(
+                "8626000000000000000000058750000000000000000000",
+            )
+            .expect("terminal_total_difficulty is a valid integer"),
             terminal_block_hash: ExecutionBlockHash::zero(),
             terminal_block_hash_activation_epoch: Epoch::new(u64::MAX),
             safe_slots_to_import_optimistically: 128u64,