diff --git a/src/google/protobuf/compiler/BUILD.bazel b/src/google/protobuf/compiler/BUILD.bazel
index 23a2fa0b4334..13a340e7ceec 100644
--- a/src/google/protobuf/compiler/BUILD.bazel
+++ b/src/google/protobuf/compiler/BUILD.bazel
@@ -133,7 +133,6 @@ cc_library(
         ":code_generator",
         ":importer",
         ":retention",
-        "//src/google/protobuf:descriptor_legacy",
         "//src/google/protobuf:protobuf_nowkt",
         "//src/google/protobuf/compiler/allowlists",
         "@com_google_absl//absl/algorithm",
diff --git a/src/google/protobuf/compiler/command_line_interface.cc b/src/google/protobuf/compiler/command_line_interface.cc
index bc7cc97506d0..e879f149bda3 100644
--- a/src/google/protobuf/compiler/command_line_interface.cc
+++ b/src/google/protobuf/compiler/command_line_interface.cc
@@ -22,7 +22,6 @@
 #include "absl/strings/str_cat.h"
 #include "absl/types/span.h"
 #include "google/protobuf/compiler/allowlists/allowlists.h"
-#include "google/protobuf/descriptor_legacy.h"
 #include "google/protobuf/descriptor_visitor.h"
 #include "google/protobuf/feature_resolver.h"
 
@@ -979,7 +978,8 @@ namespace {
 
 bool ContainsProto3Optional(const Descriptor* desc) {
   for (int i = 0; i < desc->field_count(); i++) {
-    if (FieldDescriptorLegacy(desc->field(i)).has_optional_keyword()) {
+    if (desc->field(i)->real_containing_oneof() == nullptr &&
+        desc->field(i)->containing_oneof() != nullptr) {
       return true;
     }
   }
diff --git a/src/google/protobuf/compiler/java/BUILD.bazel b/src/google/protobuf/compiler/java/BUILD.bazel
index 1f771c8f6ea0..bac458730422 100644
--- a/src/google/protobuf/compiler/java/BUILD.bazel
+++ b/src/google/protobuf/compiler/java/BUILD.bazel
@@ -37,7 +37,6 @@ cc_library(
     visibility = ["//pkg:__pkg__"],
     deps = [
         ":java_features_bootstrap",
-        "//src/google/protobuf:descriptor_legacy",
         "//src/google/protobuf:protobuf_nowkt",
         "//src/google/protobuf/compiler:code_generator",
         "//src/google/protobuf/compiler:versions",
@@ -130,7 +129,6 @@ cc_library(
         ":names",
         ":names_internal",
         "//src/google/protobuf:arena",
-        "//src/google/protobuf:descriptor_legacy",
         "//src/google/protobuf:protobuf_nowkt",
         "//src/google/protobuf/compiler:code_generator",
         "//src/google/protobuf/compiler:retention",
diff --git a/src/google/protobuf/compiler/java/helpers.cc b/src/google/protobuf/compiler/java/helpers.cc
index 06a0a37afd9e..55b38c1d7571 100644
--- a/src/google/protobuf/compiler/java/helpers.cc
+++ b/src/google/protobuf/compiler/java/helpers.cc
@@ -30,7 +30,6 @@
 #include "google/protobuf/compiler/java/name_resolver.h"
 #include "google/protobuf/compiler/versions.h"
 #include "google/protobuf/descriptor.pb.h"
-#include "google/protobuf/descriptor_legacy.h"
 #include "google/protobuf/io/printer.h"
 #include "google/protobuf/io/strtod.h"
 #include "google/protobuf/wire_format.h"
@@ -828,8 +827,7 @@ bool HasRequiredFields(const Descriptor* type) {
 }
 
 bool IsRealOneof(const FieldDescriptor* descriptor) {
-  return descriptor->containing_oneof() &&
-         !OneofDescriptorLegacy(descriptor->containing_oneof()).is_synthetic();
+  return descriptor->real_containing_oneof();
 }
 
 bool HasRepeatedFields(const Descriptor* descriptor) {
diff --git a/src/google/protobuf/compiler/java/message_field.cc b/src/google/protobuf/compiler/java/message_field.cc
index 0351c517d1c3..d5f89874570a 100644
--- a/src/google/protobuf/compiler/java/message_field.cc
+++ b/src/google/protobuf/compiler/java/message_field.cc
@@ -19,7 +19,6 @@
 #include "google/protobuf/compiler/java/doc_comment.h"
 #include "google/protobuf/compiler/java/helpers.h"
 #include "google/protobuf/compiler/java/name_resolver.h"
-#include "google/protobuf/descriptor_legacy.h"
 #include "google/protobuf/io/printer.h"
 #include "google/protobuf/wire_format.h"
 
@@ -407,7 +406,8 @@ void ImmutableMessageFieldGenerator::GenerateKotlinDslMembers(
 }
 
 void ImmutableMessageFieldGenerator::GenerateKotlinOrNull(io::Printer* printer) const {
-  if (FieldDescriptorLegacy(descriptor_).has_optional_keyword()) {
+  if (descriptor_->has_presence() &&
+      descriptor_->real_containing_oneof() == nullptr) {
     printer->Print(variables_,
                    "public val $classname$Kt.Dsl.$name$OrNull: $kt_type$?\n"
                    "  get() = $kt_dsl_builder$.$name$OrNull\n");
diff --git a/src/google/protobuf/compiler/java/message_field_lite.cc b/src/google/protobuf/compiler/java/message_field_lite.cc
index 17a9fa789f88..45997ef324db 100644
--- a/src/google/protobuf/compiler/java/message_field_lite.cc
+++ b/src/google/protobuf/compiler/java/message_field_lite.cc
@@ -19,7 +19,6 @@
 #include "google/protobuf/compiler/java/doc_comment.h"
 #include "google/protobuf/compiler/java/helpers.h"
 #include "google/protobuf/compiler/java/name_resolver.h"
-#include "google/protobuf/descriptor_legacy.h"
 #include "google/protobuf/io/printer.h"
 #include "google/protobuf/wire_format.h"
 
@@ -309,7 +308,8 @@ void ImmutableMessageFieldLiteGenerator::GenerateKotlinDslMembers(
 }
 
 void ImmutableMessageFieldLiteGenerator::GenerateKotlinOrNull(io::Printer* printer) const {
-  if (FieldDescriptorLegacy(descriptor_).has_optional_keyword()) {
+  if (descriptor_->has_presence() &&
+      descriptor_->real_containing_oneof() == nullptr) {
     printer->Print(variables_,
                    "public val $classname$Kt.Dsl.$name$OrNull: $kt_type$?\n"
                    "  get() = $kt_dsl_builder$.$name$OrNull\n");
diff --git a/src/google/protobuf/compiler/java/message_lite.cc b/src/google/protobuf/compiler/java/message_lite.cc
index 8c20affd0fdb..71b368997d11 100644
--- a/src/google/protobuf/compiler/java/message_lite.cc
+++ b/src/google/protobuf/compiler/java/message_lite.cc
@@ -31,7 +31,6 @@
 #include "google/protobuf/compiler/java/message_builder_lite.h"
 #include "google/protobuf/compiler/java/name_resolver.h"
 #include "google/protobuf/descriptor.pb.h"
-#include "google/protobuf/descriptor_legacy.h"
 #include "google/protobuf/io/coded_stream.h"
 #include "google/protobuf/io/printer.h"
 #include "google/protobuf/wire_format.h"
diff --git a/src/google/protobuf/compiler/python/BUILD.bazel b/src/google/protobuf/compiler/python/BUILD.bazel
index e9501f2b56d4..5fe960417af4 100644
--- a/src/google/protobuf/compiler/python/BUILD.bazel
+++ b/src/google/protobuf/compiler/python/BUILD.bazel
@@ -26,7 +26,6 @@ cc_library(
         "@com_github_grpc_grpc//tools/distrib/python/grpcio_tools:__subpackages__",
     ],
     deps = [
-        "//src/google/protobuf:descriptor_legacy",
         "//src/google/protobuf:protobuf_nowkt",
         "//src/google/protobuf/compiler:code_generator",
         "//src/google/protobuf/compiler:retention",
diff --git a/src/google/protobuf/compiler/python/generator.cc b/src/google/protobuf/compiler/python/generator.cc
index 9b2cdf3d15fd..555e4edef19f 100644
--- a/src/google/protobuf/compiler/python/generator.cc
+++ b/src/google/protobuf/compiler/python/generator.cc
@@ -48,7 +48,6 @@
 #include "google/protobuf/compiler/versions.h"
 #include "google/protobuf/descriptor.h"
 #include "google/protobuf/descriptor.pb.h"
-#include "google/protobuf/descriptor_legacy.h"
 #include "google/protobuf/descriptor_visitor.h"
 #include "google/protobuf/dynamic_message.h"
 #include "google/protobuf/io/printer.h"
@@ -167,6 +166,17 @@ std::string OptionsValue(absl::string_view serialized_options) {
   }
 }
 
+std::string GetLegacySyntaxName(Edition edition) {
+  switch (edition) {
+    case Edition::EDITION_PROTO2:
+      return "proto2";
+    case Edition::EDITION_PROTO3:
+      return "proto3";
+    default:
+      return "editions";
+  }
+}
+
 }  // namespace
 
 Generator::Generator() : file_(nullptr) {}
@@ -534,8 +544,7 @@ void Generator::PrintFileDescriptor() const {
   m["descriptor_name"] = kDescriptorKey;
   m["name"] = file_->name();
   m["package"] = file_->package();
-  m["syntax"] = std::string(
-      FileDescriptorLegacy::SyntaxName(FileDescriptorLegacy(file_).syntax()));
+  m["syntax"] = GetLegacySyntaxName(file_->edition());
   m["edition"] = Edition_Name(file_->edition());
   m["options"] = OptionsValue(proto_.options().SerializeAsString());
   m["serialized_descriptor"] = absl::CHexEscape(file_descriptor_serialized_);
diff --git a/src/google/protobuf/compiler/ruby/BUILD.bazel b/src/google/protobuf/compiler/ruby/BUILD.bazel
index 62afc3c35a5f..9e921542fcfa 100644
--- a/src/google/protobuf/compiler/ruby/BUILD.bazel
+++ b/src/google/protobuf/compiler/ruby/BUILD.bazel
@@ -17,7 +17,6 @@ cc_library(
         "//src/google/protobuf/compiler:__pkg__",
     ],
     deps = [
-        "//src/google/protobuf:descriptor_legacy",
         "//src/google/protobuf:protobuf_nowkt",
         "//src/google/protobuf/compiler:code_generator",
         "//src/google/protobuf/compiler:retention",
diff --git a/src/google/protobuf/compiler/ruby/ruby_generator.cc b/src/google/protobuf/compiler/ruby/ruby_generator.cc
index 12a5c12e7a4e..1d85046b24a1 100644
--- a/src/google/protobuf/compiler/ruby/ruby_generator.cc
+++ b/src/google/protobuf/compiler/ruby/ruby_generator.cc
@@ -19,7 +19,6 @@
 #include "google/protobuf/compiler/retention.h"
 #include "google/protobuf/descriptor.h"
 #include "google/protobuf/descriptor.pb.h"
-#include "google/protobuf/descriptor_legacy.h"
 #include "google/protobuf/io/printer.h"
 #include "google/protobuf/io/zero_copy_stream.h"
 
@@ -320,12 +319,6 @@ bool Generator::Generate(const FileDescriptor* file,
                          const std::string& parameter,
                          GeneratorContext* generator_context,
                          std::string* error) const {
-  if (FileDescriptorLegacy(file).syntax() ==
-      FileDescriptorLegacy::Syntax::SYNTAX_UNKNOWN) {
-    *error = "Invalid or unsupported proto syntax";
-    return false;
-  }
-
   std::unique_ptr<io::ZeroCopyOutputStream> output(
       generator_context->Open(GetOutputFilename(file->name())));
   io::Printer printer(output.get(), '$');