diff --git a/CHANGELOG.md b/CHANGELOG.md
index 80d6f7e5..c490bfea 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,14 +4,24 @@ Version 286:
 * Refactor buffers_adapter
 * Refactor static_buffer
 * Refactor flat_buffer
+* Refactor flat_static_buffer
 
 API Changes:
 
-* multi_buffer::mutable_data_type is deprecated. Use multi_buffer::mutable_buffers_type instead.
-* buffers_adaptor::mutable_data_type is deprecated. Use buffers_adaptor::mutable_buffers_type instead.
-* static_buffer::mutable_data_type is deprecated. Use static_buffer::mutable_buffers_type instead.
-* static_buffer_base::mutable_data_type is deprecated. Use static_buffer_base::mutable_buffers_type instead.
-* flat_buffer::mutable_data_type is deprecated. Use flat_buffer::mutable_buffers_type instead.
+* Nested const and mutable buffer types for all
+  Beast dynamic buffers are refactored. Affected types:
+  - buffers_adapter
+  - flat_buffer
+  - flat_static_buffer
+  - multi_buffer
+  - static_buffer
+  
+* Nested mutable_data_type in Beast dynamic buffers is deprecated:
+
+Changes Required:
+
+* Use nested mutable_buffers_type instead of mutable_data_type,
+  or define BOOST_BEAST_ALLOW_DEPRECATED
 
 --------------------------------------------------------------------------------
 
diff --git a/include/boost/beast/core/flat_static_buffer.hpp b/include/boost/beast/core/flat_static_buffer.hpp
index f951fe2c..eae4be47 100644
--- a/include/boost/beast/core/flat_static_buffer.hpp
+++ b/include/boost/beast/core/flat_static_buffer.hpp
@@ -114,8 +114,9 @@ public:
     /// The ConstBufferSequence used to represent the readable bytes.
     using const_buffers_type = net::const_buffer;
 
-    /// The MutableBufferSequence used to represent the readable bytes.
+#ifdef BOOST_BEAST_ALLOW_DEPRECATED
     using mutable_data_type = net::mutable_buffer;
+#endif
 
     /// The MutableBufferSequence used to represent the writable bytes.
     using mutable_buffers_type = net::mutable_buffer;
@@ -156,7 +157,7 @@ public:
     }
 
     /// Returns a mutable buffer sequence representing the readable bytes
-    mutable_data_type
+    mutable_buffers_type
     data() noexcept
     {
         return {in_, dist(in_, out_)};
diff --git a/test/beast/core/test_buffer.hpp b/test/beast/core/test_buffer.hpp
index 8cc6e555..3b72dccf 100644
--- a/test/beast/core/test_buffer.hpp
+++ b/test/beast/core/test_buffer.hpp
@@ -244,7 +244,7 @@ struct is_mutable_dynamic_buffer<T, detail::void_t<decltype(
         std::declval<T const&>().data(),
     std::declval<typename T::const_buffers_type&>() =
         std::declval<T&>().cdata(),
-    std::declval<typename T::mutable_data_type&>() =
+    std::declval<typename T::mutable_buffers_type&>() =
         std::declval<T&>().data()
     ) > > : net::is_dynamic_buffer_v1<T>
 {
@@ -287,11 +287,11 @@ test_mutable_dynamic_buffer(
 {
     BOOST_STATIC_ASSERT(
         net::is_mutable_buffer_sequence<typename
-            MutableDynamicBuffer_v0::mutable_data_type>::value);
+            MutableDynamicBuffer_v0::mutable_buffers_type>::value);
 
     BOOST_STATIC_ASSERT(
         std::is_convertible<
-            typename MutableDynamicBuffer_v0::mutable_data_type,
+            typename MutableDynamicBuffer_v0::mutable_buffers_type,
             typename MutableDynamicBuffer_v0::const_buffers_type>::value);
 
     string_view src = "Hello, world!";