diff --git a/src/Nethermind/Nethermind.JsonRpc.Test/Data/SerializationTestBase.cs b/src/Nethermind/Nethermind.JsonRpc.Test/Data/SerializationTestBase.cs
index 9481c0e77d7..af8d325612c 100644
--- a/src/Nethermind/Nethermind.JsonRpc.Test/Data/SerializationTestBase.cs
+++ b/src/Nethermind/Nethermind.JsonRpc.Test/Data/SerializationTestBase.cs
@@ -69,7 +69,7 @@ protected void TestToJson<T>(T item, string expectedResult, params JsonConverter
         IJsonSerializer serializer = BuildSerializer(converters);
 
         string result = serializer.Serialize(item);
-        Assert.That(result, Is.EqualTo(expectedResult.Replace("+", "\\u002B")), result.Replace("\"", "\\\""));
+        Assert.That(result, Is.EqualTo(expectedResult), result.Replace("\"", "\\\""));
     }
 
     private static IJsonSerializer BuildSerializer(params JsonConverter[] converters) => new EthereumJsonSerializer(converters);
diff --git a/src/Nethermind/Nethermind.Serialization.Json/EthereumJsonSerializer.cs b/src/Nethermind/Nethermind.Serialization.Json/EthereumJsonSerializer.cs
index a99afd49a63..01e23bfccf6 100644
--- a/src/Nethermind/Nethermind.Serialization.Json/EthereumJsonSerializer.cs
+++ b/src/Nethermind/Nethermind.Serialization.Json/EthereumJsonSerializer.cs
@@ -6,8 +6,10 @@
 using System.Collections.Generic;
 using System.IO;
 using System.IO.Pipelines;
+using System.Text.Encodings.Web;
 using System.Text.Json;
 using System.Text.Json.Serialization;
+using System.Text.Unicode;
 using System.Threading.Tasks;
 using Nethermind.Core.Collections;
 
@@ -63,6 +65,7 @@ private static JsonSerializerOptions CreateOptions(bool indented, IEnumerable<Js
                 DictionaryKeyPolicy = JsonNamingPolicy.CamelCase,
                 PropertyNameCaseInsensitive = true,
                 MaxDepth = maxDepth,
+                Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping,
                 Converters =
                 {
                     new LongConverter(),