diff --git a/src/main/java/com/rabbitmq/stream/ChannelCustomizer.java b/src/main/java/com/rabbitmq/stream/ChannelCustomizer.java
deleted file mode 100644
index b53593e6b4..0000000000
--- a/src/main/java/com/rabbitmq/stream/ChannelCustomizer.java
+++ /dev/null
@@ -1,39 +0,0 @@
-// Copyright (c) 2020-2023 VMware, Inc. or its affiliates.  All rights reserved.
-//
-// This software, the RabbitMQ Stream Java client library, is dual-licensed under the
-// Mozilla Public License 2.0 ("MPL"), and the Apache License version 2 ("ASL").
-// For the MPL, please see LICENSE-MPL-RabbitMQ. For the ASL,
-// please see LICENSE-APACHE2.
-//
-// This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND,
-// either express or implied. See the LICENSE file for specific language governing
-// rights and limitations of this software.
-//
-// If you have any questions regarding licensing, please contact us at
-// info@rabbitmq.com.
-package com.rabbitmq.stream;
-
-import com.rabbitmq.stream.EnvironmentBuilder.NettyConfiguration;
-import io.netty.channel.Channel;
-import java.util.Objects;
-import java.util.function.Consumer;
-
-/**
- * An extension point to customize Netty's {@link io.netty.channel.Channel}s used for connection.
- *
- * @deprecated use {@link NettyConfiguration#channelCustomizer(Consumer)} from {@link
- *     EnvironmentBuilder#netty()} instead
- * @see NettyConfiguration#netty()
- */
-public interface ChannelCustomizer {
-
-  void customize(Channel channel);
-
-  default ChannelCustomizer andThen(ChannelCustomizer after) {
-    Objects.requireNonNull(after);
-    return ch -> {
-      customize(ch);
-      after.customize(ch);
-    };
-  }
-}
diff --git a/src/main/java/com/rabbitmq/stream/EnvironmentBuilder.java b/src/main/java/com/rabbitmq/stream/EnvironmentBuilder.java
index a46e3e8e4c..b6845ca73c 100644
--- a/src/main/java/com/rabbitmq/stream/EnvironmentBuilder.java
+++ b/src/main/java/com/rabbitmq/stream/EnvironmentBuilder.java
@@ -187,39 +187,6 @@ public interface EnvironmentBuilder {
    */
   EnvironmentBuilder requestedMaxFrameSize(int requestedMaxFrameSize);
 
-  /**
-   * The Netty {@link EventLoopGroup} instance to use.
-   *
-   * <p>The environment uses its own instance by default. It is the developer's responsibility to
-   * close the {@link EventLoopGroup} they provide.
-   *
-   * @param eventLoopGroup
-   * @return this builder instance
-   * @deprecated use {@link NettyConfiguration#eventLoopGroup(EventLoopGroup)} from {@link #netty()}
-   *     instead
-   */
-  EnvironmentBuilder eventLoopGroup(EventLoopGroup eventLoopGroup);
-
-  /**
-   * Netty's {@link io.netty.buffer.ByteBuf} allocator.
-   *
-   * @param byteBufAllocator
-   * @return this builder instance
-   * @deprecated use {@link NettyConfiguration#byteBufAllocator(ByteBufAllocator)} from {@link
-   *     #netty()} instead
-   */
-  EnvironmentBuilder byteBufAllocator(ByteBufAllocator byteBufAllocator);
-
-  /**
-   * An extension point to customize Netty's {@link io.netty.channel.Channel}s used for connection.
-   *
-   * @param channelCustomizer
-   * @return this builder instance
-   * @deprecated use {@link NettyConfiguration#channelCustomizer(Consumer)} from {@link #netty()}
-   *     instead
-   */
-  EnvironmentBuilder channelCustomizer(ChannelCustomizer channelCustomizer);
-
   /**
    * The checksum strategy used for chunk checksum.
    *
diff --git a/src/main/java/com/rabbitmq/stream/impl/StreamEnvironmentBuilder.java b/src/main/java/com/rabbitmq/stream/impl/StreamEnvironmentBuilder.java
index 70914bb91c..e087ebc64b 100644
--- a/src/main/java/com/rabbitmq/stream/impl/StreamEnvironmentBuilder.java
+++ b/src/main/java/com/rabbitmq/stream/impl/StreamEnvironmentBuilder.java
@@ -134,26 +134,12 @@ public EnvironmentBuilder compressionCodecFactory(
     return this;
   }
 
-  @SuppressWarnings("deprecation")
-  @Override
-  public EnvironmentBuilder eventLoopGroup(EventLoopGroup eventLoopGroup) {
-    this.netty().eventLoopGroup(eventLoopGroup);
-    return this;
-  }
-
   @Override
   public EnvironmentBuilder id(String id) {
     this.id = id;
     return this;
   }
 
-  @SuppressWarnings("deprecation")
-  @Override
-  public EnvironmentBuilder byteBufAllocator(ByteBufAllocator byteBufAllocator) {
-    this.netty().byteBufAllocator(byteBufAllocator);
-    return this;
-  }
-
   @Override
   public EnvironmentBuilder rpcTimeout(Duration timeout) {
     this.clientParameters.rpcTimeout(timeout);
@@ -195,13 +181,6 @@ public StreamEnvironmentBuilder requestedMaxFrameSize(int requestedMaxFrameSize)
     return this;
   }
 
-  @SuppressWarnings("deprecation")
-  public StreamEnvironmentBuilder channelCustomizer(
-      com.rabbitmq.stream.ChannelCustomizer channelCustomizer) {
-    this.netty().channelCustomizer(ch -> channelCustomizer.customize(ch));
-    return this;
-  }
-
   public StreamEnvironmentBuilder chunkChecksum(ChunkChecksum chunkChecksum) {
     this.clientParameters.chunkChecksum(chunkChecksum);
     return this;