diff --git a/src/runtime/Codecs/DecoderGroup.cs b/src/runtime/Codecs/DecoderGroup.cs
index 8a290d5d4..cc511ed50 100644
--- a/src/runtime/Codecs/DecoderGroup.cs
+++ b/src/runtime/Codecs/DecoderGroup.cs
@@ -8,7 +8,6 @@ namespace Python.Runtime.Codecs
     /// <summary>
     /// Represents a group of <see cref="IPyObjectDecoder"/>s. Useful to group them by priority.
     /// </summary>
-    [Obsolete(Util.UnstableApiMessage)]
     public sealed class DecoderGroup: IPyObjectDecoder, IEnumerable<IPyObjectDecoder>
     {
         readonly List<IPyObjectDecoder> decoders = new List<IPyObjectDecoder>();
@@ -49,7 +48,6 @@ public bool TryDecode<T>(PyObject pyObj, out T value)
         IEnumerator IEnumerable.GetEnumerator() => this.decoders.GetEnumerator();
     }
 
-    [Obsolete(Util.UnstableApiMessage)]
     public static class DecoderGroupExtensions
     {
         /// <summary>
@@ -58,7 +56,6 @@ public static class DecoderGroupExtensions
         /// that can decode from <paramref name="objectType"/> to <paramref name="targetType"/>,
         /// or <c>null</c> if a matching decoder can not be found.
         /// </summary>
-        [Obsolete(Util.UnstableApiMessage)]
         public static IPyObjectDecoder GetDecoder(
             this IPyObjectDecoder decoder,
             PyObject objectType, Type targetType)
diff --git a/src/runtime/Codecs/EncoderGroup.cs b/src/runtime/Codecs/EncoderGroup.cs
index a5708c0bb..4f776a669 100644
--- a/src/runtime/Codecs/EncoderGroup.cs
+++ b/src/runtime/Codecs/EncoderGroup.cs
@@ -8,7 +8,6 @@ namespace Python.Runtime.Codecs
     /// <summary>
     /// Represents a group of <see cref="IPyObjectDecoder"/>s. Useful to group them by priority.
     /// </summary>
-    [Obsolete(Util.UnstableApiMessage)]
     public sealed class EncoderGroup: IPyObjectEncoder, IEnumerable<IPyObjectEncoder>
     {
         readonly List<IPyObjectEncoder> encoders = new List<IPyObjectEncoder>();
@@ -50,7 +49,6 @@ public PyObject TryEncode(object value)
         IEnumerator IEnumerable.GetEnumerator() => this.encoders.GetEnumerator();
     }
 
-    [Obsolete(Util.UnstableApiMessage)]
     public static class EncoderGroupExtensions
     {
         /// <summary>
@@ -58,7 +56,6 @@ public static class EncoderGroupExtensions
         /// (potentially selecting one from a collection),
         /// that can encode the specified <paramref name="type"/>.
         /// </summary>
-        [Obsolete(Util.UnstableApiMessage)]
         public static IEnumerable<IPyObjectEncoder> GetEncoders(this IPyObjectEncoder decoder, Type type)
         {
             if (decoder is null) throw new ArgumentNullException(nameof(decoder));
diff --git a/src/runtime/Codecs/RawProxyEncoder.cs b/src/runtime/Codecs/RawProxyEncoder.cs
index a1b6c52b3..37ad0487b 100644
--- a/src/runtime/Codecs/RawProxyEncoder.cs
+++ b/src/runtime/Codecs/RawProxyEncoder.cs
@@ -6,7 +6,6 @@ namespace Python.Runtime.Codecs
     /// A .NET object encoder, that returns raw proxies (e.g. no conversion to Python types).
     /// <para>You must inherit from this class and override <see cref="CanEncode"/>.</para>
     /// </summary>
-    [Obsolete(Util.UnstableApiMessage)]
     public class RawProxyEncoder: IPyObjectEncoder
     {
         public PyObject TryEncode(object value)
diff --git a/src/runtime/Codecs/TupleCodecs.cs b/src/runtime/Codecs/TupleCodecs.cs
index a9ae33fe0..5ac55846f 100644
--- a/src/runtime/Codecs/TupleCodecs.cs
+++ b/src/runtime/Codecs/TupleCodecs.cs
@@ -5,7 +5,6 @@ namespace Python.Runtime.Codecs
     using System.Linq;
     using System.Reflection;
 
-    [Obsolete(Util.UnstableApiMessage)]
     public sealed class TupleCodec<TTuple> : IPyObjectEncoder, IPyObjectDecoder
     {
         TupleCodec() { }
diff --git a/src/runtime/converterextensions.cs b/src/runtime/converterextensions.cs
index 667fc6f00..b10d0c59f 100644
--- a/src/runtime/converterextensions.cs
+++ b/src/runtime/converterextensions.cs
@@ -10,7 +10,6 @@ namespace Python.Runtime
     /// <summary>
     /// Defines <see cref="PyObject"/> conversion to CLR types (unmarshalling)
     /// </summary>
-    [Obsolete(Util.UnstableApiMessage)]
     public interface IPyObjectDecoder
     {
         /// <summary>
@@ -30,7 +29,6 @@ public interface IPyObjectDecoder
     /// <summary>
     /// Defines conversion from CLR objects into Python objects (e.g. <see cref="PyObject"/>) (marshalling)
     /// </summary>
-    [Obsolete(Util.UnstableApiMessage)]
     public interface IPyObjectEncoder
     {
         /// <summary>
@@ -47,7 +45,6 @@ public interface IPyObjectEncoder
     /// This class allows to register additional marshalling codecs.
     /// <para>Python.NET will pick suitable encoder/decoder registered first</para>
     /// </summary>
-    [Obsolete(Util.UnstableApiMessage)]
     public static class PyObjectConversions
     {
         static readonly DecoderGroup decoders = new DecoderGroup();