diff --git a/beacon_chain/eth1/deposit_contract.nim.cfg b/beacon_chain/eth1/deposit_contract.nim.cfg
index 640602daa..e69de29bb 100644
--- a/beacon_chain/eth1/deposit_contract.nim.cfg
+++ b/beacon_chain/eth1/deposit_contract.nim.cfg
@@ -1 +0,0 @@
--d:"json_rpc_websocket_package=websock"
diff --git a/beacon_chain/nimbus_beacon_node.nim.cfg b/beacon_chain/nimbus_beacon_node.nim.cfg
index e81778d2c..4c0d44247 100644
--- a/beacon_chain/nimbus_beacon_node.nim.cfg
+++ b/beacon_chain/nimbus_beacon_node.nim.cfg
@@ -5,5 +5,3 @@
 @if release:
   -d:"chronicles_line_numbers:0"
 @end
-
--d:"json_rpc_websocket_package=websock"
diff --git a/beacon_chain/nimbus_light_client.nim.cfg b/beacon_chain/nimbus_light_client.nim.cfg
index e81778d2c..4c0d44247 100644
--- a/beacon_chain/nimbus_light_client.nim.cfg
+++ b/beacon_chain/nimbus_light_client.nim.cfg
@@ -5,5 +5,3 @@
 @if release:
   -d:"chronicles_line_numbers:0"
 @end
-
--d:"json_rpc_websocket_package=websock"
diff --git a/beacon_chain/nimbus_validator_client.nim.cfg b/beacon_chain/nimbus_validator_client.nim.cfg
index e81778d2c..4c0d44247 100644
--- a/beacon_chain/nimbus_validator_client.nim.cfg
+++ b/beacon_chain/nimbus_validator_client.nim.cfg
@@ -5,5 +5,3 @@
 @if release:
   -d:"chronicles_line_numbers:0"
 @end
-
--d:"json_rpc_websocket_package=websock"
diff --git a/research/block_sim.nim.cfg b/research/block_sim.nim.cfg
index 6e81763f9..7987cf972 100644
--- a/research/block_sim.nim.cfg
+++ b/research/block_sim.nim.cfg
@@ -1,3 +1 @@
 -d:"chronicles_sinks=json[file(block_sim.log)]"
-
--d:"json_rpc_websocket_package=websock"
diff --git a/tests/nim.cfg b/tests/nim.cfg
index 87aa7a66a..cdcd4a8e9 100644
--- a/tests/nim.cfg
+++ b/tests/nim.cfg
@@ -1,8 +1,6 @@
 # Use only `secp256k1` public key cryptography as an identity in LibP2P.
 -d:"libp2p_pki_schemes=secp256k1"
 
--d:"json_rpc_websocket_package=websock"
-
 -d:chronosStrictException
 --styleCheck:usages
 --styleCheck:hint
diff --git a/vendor/nim-json-rpc b/vendor/nim-json-rpc
index e6810af61..b4aff8fec 160000
--- a/vendor/nim-json-rpc
+++ b/vendor/nim-json-rpc
@@ -1 +1 @@
-Subproject commit e6810af6188a1a3433ecca6240a708eb9e595a8f
+Subproject commit b4aff8fec55195d035188210f85ae540b600a777