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 d762ecfbda..7987899c3d 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
@@ -74,8 +74,8 @@ CHURN_LIMIT_QUOTIENT: 4096
 
 # Fork choice
 # ---------------------------------------------------------------
-# 70%
-PROPOSER_SCORE_BOOST: 70
+# 40%
+PROPOSER_SCORE_BOOST: 40
 
 # Deposit contract
 # ---------------------------------------------------------------
diff --git a/common/eth2_network_config/built_in_network_configs/mainnet/config.yaml b/common/eth2_network_config/built_in_network_configs/mainnet/config.yaml
index 16aa507eed..cc4e7dcab4 100644
--- a/common/eth2_network_config/built_in_network_configs/mainnet/config.yaml
+++ b/common/eth2_network_config/built_in_network_configs/mainnet/config.yaml
@@ -74,8 +74,8 @@ CHURN_LIMIT_QUOTIENT: 65536
 
 # Fork choice
 # ---------------------------------------------------------------
-# 70%
-PROPOSER_SCORE_BOOST: 70
+# 40%
+PROPOSER_SCORE_BOOST: 40
 
 # Deposit contract
 # ---------------------------------------------------------------
diff --git a/common/eth2_network_config/built_in_network_configs/prater/config.yaml b/common/eth2_network_config/built_in_network_configs/prater/config.yaml
index 106c95595e..d337c4120a 100644
--- a/common/eth2_network_config/built_in_network_configs/prater/config.yaml
+++ b/common/eth2_network_config/built_in_network_configs/prater/config.yaml
@@ -74,8 +74,8 @@ CHURN_LIMIT_QUOTIENT: 65536
 
 # Fork choice
 # ---------------------------------------------------------------
-# 70%
-PROPOSER_SCORE_BOOST: 70
+# 40%
+PROPOSER_SCORE_BOOST: 40
 
 # Deposit contract
 # ---------------------------------------------------------------
diff --git a/common/eth2_network_config/built_in_network_configs/ropsten/config.yaml b/common/eth2_network_config/built_in_network_configs/ropsten/config.yaml
index 7afb189f9b..45921aec53 100644
--- a/common/eth2_network_config/built_in_network_configs/ropsten/config.yaml
+++ b/common/eth2_network_config/built_in_network_configs/ropsten/config.yaml
@@ -59,6 +59,11 @@ MIN_PER_EPOCH_CHURN_LIMIT: 4
 CHURN_LIMIT_QUOTIENT: 65536
 
 
+# Fork choice
+# ---------------------------------------------------------------
+# 40%
+PROPOSER_SCORE_BOOST: 40
+
 # Deposit contract
 # ---------------------------------------------------------------
 DEPOSIT_CHAIN_ID: 3
diff --git a/consensus/types/src/chain_spec.rs b/consensus/types/src/chain_spec.rs
index eb081f3ec7..c283d4cb48 100644
--- a/consensus/types/src/chain_spec.rs
+++ b/consensus/types/src/chain_spec.rs
@@ -500,7 +500,7 @@ impl ChainSpec {
              * Fork choice
              */
             safe_slots_to_update_justified: 8,
-            proposer_score_boost: Some(70),
+            proposer_score_boost: Some(40),
 
             /*
              * Eth1
@@ -698,7 +698,7 @@ impl ChainSpec {
              * Fork choice
              */
             safe_slots_to_update_justified: 8,
-            proposer_score_boost: Some(70),
+            proposer_score_boost: Some(40),
 
             /*
              * Eth1
@@ -1261,7 +1261,7 @@ mod yaml_tests {
         EJECTION_BALANCE: 16000000000
         MIN_PER_EPOCH_CHURN_LIMIT: 4
         CHURN_LIMIT_QUOTIENT: 65536
-        PROPOSER_SCORE_BOOST: 70
+        PROPOSER_SCORE_BOOST: 40
         DEPOSIT_CHAIN_ID: 1
         DEPOSIT_NETWORK_ID: 1
         DEPOSIT_CONTRACT_ADDRESS: 0x00000000219ab540356cBB839Cbe05303d7705Fa
diff --git a/lighthouse/environment/tests/testnet_dir/config.yaml b/lighthouse/environment/tests/testnet_dir/config.yaml
index 8424a2fdc3..33aa8ad165 100644
--- a/lighthouse/environment/tests/testnet_dir/config.yaml
+++ b/lighthouse/environment/tests/testnet_dir/config.yaml
@@ -72,8 +72,8 @@ CHURN_LIMIT_QUOTIENT: 65536
 
 # Fork choice
 # ---------------------------------------------------------------
-# 70%
-PROPOSER_SCORE_BOOST: 70
+# 40%
+PROPOSER_SCORE_BOOST: 40
 
 # Deposit contract
 # ---------------------------------------------------------------