diff --git a/apps/explorer/config/prod/parity.exs b/apps/explorer/config/prod/parity.exs
index 3b2a6b9cd9..50bc221517 100644
--- a/apps/explorer/config/prod/parity.exs
+++ b/apps/explorer/config/prod/parity.exs
@@ -5,11 +5,11 @@ config :explorer,
     transport: EthereumJSONRPC.HTTP,
     transport_options: [
       http: EthereumJSONRPC.HTTP.HTTPoison,
-      url: "https://sokol.poa.network",
+      url: System.get_env("ETHEREUM_URL") || "https://sokol.poa.network",
       method_to_url: [
-        eth_call: "https://sokol-trace.poa.network",
-        eth_getBalance: "https://sokol-trace.poa.network",
-        trace_replayTransaction: "https://sokol-trace.poa.network"
+        eth_call: System.get_env("TRACE_URL") || "https://sokol-trace.poa.network",
+        eth_getBalance: System.get_env("TRACE_URL") || "https://sokol-trace.poa.network",
+        trace_replayTransaction: System.get_env("TRACE_URL") || "https://sokol-trace.poa.network"
       ],
       http_options: [recv_timeout: 60_000, timeout: 60_000, hackney: [pool: :ethereum_jsonrpc]]
     ],
@@ -19,7 +19,7 @@ config :explorer,
     transport: EthereumJSONRPC.WebSocket,
     transport_options: [
       web_socket: EthereumJSONRPC.WebSocket.WebSocketClient,
-      url: "wss://sokol-ws.poa.network/ws"
+      url: System.get_env("WS_URL") || "wss://sokol-ws.poa.network/ws"
     ],
     variant: EthereumJSONRPC.Parity
   ]
diff --git a/apps/indexer/config/prod/parity.exs b/apps/indexer/config/prod/parity.exs
index f20154e6b7..42e70e3ba8 100644
--- a/apps/indexer/config/prod/parity.exs
+++ b/apps/indexer/config/prod/parity.exs
@@ -6,10 +6,10 @@ config :indexer,
     transport: EthereumJSONRPC.HTTP,
     transport_options: [
       http: EthereumJSONRPC.HTTP.HTTPoison,
-      url: "https://sokol.poa.network",
+      url: System.get_env("ETHEREUM_URL") || "https://sokol.poa.network",
       method_to_url: [
-        eth_getBalance: "https://sokol-trace.poa.network",
-        trace_replayTransaction: "https://sokol-trace.poa.network"
+        eth_getBalance: System.get_env("TRACE_URL") || "https://sokol-trace.poa.network",
+        trace_replayTransaction: System.get_env("TRACE_URL") || "https://sokol-trace.poa.network"
       ],
       http_options: [recv_timeout: 60_000, timeout: 60_000, hackney: [pool: :ethereum_jsonrpc]]
     ],
@@ -19,6 +19,6 @@ config :indexer,
     transport: EthereumJSONRPC.WebSocket,
     transport_options: [
       web_socket: EthereumJSONRPC.WebSocket.WebSocketClient,
-      url: "wss://sokol-ws.poa.network/ws"
+      url: System.get_env("WS_URL") || "wss://sokol-ws.poa.network/ws"
     ]
   ]