diff --git a/beacon_chain/inspector.nim.cfg b/beacon_chain/inspector.nim.cfg
index 59facb302..e233b3ddc 100644
--- a/beacon_chain/inspector.nim.cfg
+++ b/beacon_chain/inspector.nim.cfg
@@ -1,3 +1,2 @@
 # Use only `secp256k1` public key cryptography as an identity in LibP2P.
 -d:"libp2p_pki_schemes=secp256k1"
--d:"UseDiscv51=true"
diff --git a/beacon_chain/nimbus_beacon_node.nim.cfg b/beacon_chain/nimbus_beacon_node.nim.cfg
index 9cba93aaa..88e356aa5 100644
--- a/beacon_chain/nimbus_beacon_node.nim.cfg
+++ b/beacon_chain/nimbus_beacon_node.nim.cfg
@@ -4,7 +4,6 @@
 
 # Use only `secp256k1` public key cryptography as an identity in LibP2P.
 -d:"libp2p_pki_schemes=secp256k1"
--d:"UseDiscv51=true"
 
 @if testnet_servers_image:
   -d:"chronicles_sinks=json"
diff --git a/beacon_chain/nimbus_beacon_node_spec_0_12_3.nim.cfg b/beacon_chain/nimbus_beacon_node_spec_0_12_3.nim.cfg
index c6d667ae9..1227ccd61 100644
--- a/beacon_chain/nimbus_beacon_node_spec_0_12_3.nim.cfg
+++ b/beacon_chain/nimbus_beacon_node_spec_0_12_3.nim.cfg
@@ -6,7 +6,6 @@
 -d:"libp2p_pki_schemes=secp256k1"
 
 -d:"ETH2_SPEC=v0.12.3"
--d:"UseDiscv51=true"
 
 @if testnet_servers_image:
   -d:"chronicles_sinks=json"
diff --git a/vendor/nim-eth b/vendor/nim-eth
index 5dff021cb..bc8a8947f 160000
--- a/vendor/nim-eth
+++ b/vendor/nim-eth
@@ -1 +1 @@
-Subproject commit 5dff021cbc97f56ea5ef73b74a392b53b20638d0
+Subproject commit bc8a8947fc146cfb0765f407528669932e604d8a