diff --git a/src/WireMock.Net.Shared/Transformers/NewtonsoftJsonBodyTransformer.cs b/src/WireMock.Net.Shared/Transformers/NewtonsoftJsonBodyTransformer.cs
index 8db63cd6..1765fcd3 100644
--- a/src/WireMock.Net.Shared/Transformers/NewtonsoftJsonBodyTransformer.cs
+++ b/src/WireMock.Net.Shared/Transformers/NewtonsoftJsonBodyTransformer.cs
@@ -22,7 +22,7 @@ namespace WireMock.Transformers;
 [PublicAPI]
 public class NewtonsoftJsonBodyTransformer(WireMockServerSettings settings) : IJsonBodyTransformer
 {
-    private readonly NewtonsoftJsonConverter _jsonConverter = new();
+    private static readonly NewtonsoftJsonConverter _jsonConverter = new();
 
     /// <inheritdoc />
     public BodyData TransformBodyAsJson(
diff --git a/src/WireMock.Net.Shared/Transformers/SystemTextJsonBodyTransformer.cs b/src/WireMock.Net.Shared/Transformers/SystemTextJsonBodyTransformer.cs
index f42d0ba4..df87e58b 100644
--- a/src/WireMock.Net.Shared/Transformers/SystemTextJsonBodyTransformer.cs
+++ b/src/WireMock.Net.Shared/Transformers/SystemTextJsonBodyTransformer.cs
@@ -17,7 +17,7 @@ namespace WireMock.Transformers;
 [PublicAPI]
 public class SystemTextJsonBodyTransformer() : IJsonBodyTransformer
 {
-    private readonly SystemTextJsonConverter _jsonConverter = new();
+    private static readonly SystemTextJsonConverter _jsonConverter = new();
 
     /// <inheritdoc />
     public BodyData TransformBodyAsJson(