diff --git a/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/encoder.ex b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/encoder.ex
index c43737cfdb..1331c8f21a 100644
--- a/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/encoder.ex
+++ b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/encoder.ex
@@ -41,6 +41,16 @@ defmodule EthereumJSONRPC.Encoder do
     {id, {:error, "(#{code}) #{message}"}}
   end
 
+  def decode_result(result, %{returns: r} = fs) when r in [:string, [:string]] do
+    case decode_result(result, %{fs | returns: {:tuple, [:string]}}) do
+      {id, {:ok, [{string}]}} ->
+        {id, {:ok, [string]}}
+
+      error ->
+        error
+    end
+  end
+
   def decode_result(%{id: id, result: result}, function_selector) do
     types_list = List.wrap(function_selector.returns)
 
diff --git a/apps/ethereum_jsonrpc/mix.exs b/apps/ethereum_jsonrpc/mix.exs
index a805dbd649..e72b607dad 100644
--- a/apps/ethereum_jsonrpc/mix.exs
+++ b/apps/ethereum_jsonrpc/mix.exs
@@ -84,7 +84,7 @@ defmodule EthereumJsonrpc.MixProject do
       # Convert unix timestamps in JSONRPC to DateTimes
       {:timex, "~> 3.4"},
       # Encode/decode function names and arguments
-      {:ex_abi, "~> 0.1.18"},
+      {:ex_abi, "~> 0.2.0"},
       # `:verify_fun` for `Socket.Web.connect`
       {:ssl_verify_fun, "~> 1.1"},
       # `EthereumJSONRPC.WebSocket`
diff --git a/apps/explorer/test/explorer/validator/metadata_retriever_test.exs b/apps/explorer/test/explorer/validator/metadata_retriever_test.exs
index 228331df94..15a1581d47 100644
--- a/apps/explorer/test/explorer/validator/metadata_retriever_test.exs
+++ b/apps/explorer/test/explorer/validator/metadata_retriever_test.exs
@@ -72,7 +72,7 @@ defmodule Explorer.Validator.MetadataRetrieverTest do
              id: id,
              jsonrpc: "2.0",
              result:
-               "0x000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000001"
+               "0x00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000001"
            }
          ]}
       end
@@ -91,7 +91,7 @@ defmodule Explorer.Validator.MetadataRetrieverTest do
              id: id,
              jsonrpc: "2.0",
              result:
-               "0x546573746e616d65000000000000000000000000000000000000000000000000556e69746172696f6e000000000000000000000000000000000000000000000030303030303030300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000140585800000000000000000000000000000000000000000000000000000000000030303030300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003afe130e000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000058585858585858207374726565742058585858585800000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
+               "0x546573746e616d65000000000000000000000000000000000000000000000000556e69746172696f6e000000000000000000000000000000000000000000000030303030303030300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000585800000000000000000000000000000000000000000000000000000000000030303030300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003afe130e000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000058585858585858207374726565742058585858585800000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
            }
          ]}
       end