diff --git a/python/google/protobuf/__init__.py b/python/google/protobuf/__init__.py
index 0e2a89f..7fd9e5a 100755
--- a/python/google/protobuf/__init__.py
+++ b/python/google/protobuf/__init__.py
@@ -30,7 +30,7 @@
 
 # Copyright 2007 Google Inc. All Rights Reserved.
 
-__version__ = '3.1.0'
+__version__ = '3.2.0'
 
 if __name__ != '__main__':
   try:
diff --git a/python/google/protobuf/internal/python_message.py b/python/google/protobuf/internal/python_message.py
index c1bd1f9..4b70103 100755
--- a/python/google/protobuf/internal/python_message.py
+++ b/python/google/protobuf/internal/python_message.py
@@ -56,17 +56,6 @@
 import weakref
 
 import six
-try:
-  import six.moves.copyreg as copyreg
-except ImportError:
-  # On some platforms, for example gMac, we run native Python because there is
-  # nothing like hermetic Python. This means lesser control on the system and
-  # the six.moves package may be missing (is missing on 20150321 on gMac). Be
-  # extra conservative and try to load the old replacement if it fails.
-  try:
-    import copy_reg as copyreg  #PY26
-  except ImportError:
-    import copyreg
 
 # We use "as" to avoid name collisions with variables.
 from google.protobuf.internal import containers
@@ -179,7 +168,6 @@
     _AddStaticMethods(cls)
     _AddMessageMethods(descriptor, cls)
     _AddPrivateHelperMethods(descriptor, cls)
-    copyreg.pickle(cls, lambda obj: (cls, (), obj.__getstate__()))
 
     superclass = super(GeneratedProtocolMessageType, cls)
     superclass.__init__(name, bases, dictionary)
@@ -1271,6 +1259,12 @@
   cls.WhichOneof = WhichOneof
 
 
+def _AddReduceMethod(cls):
+  def __reduce__(self):  # pylint: disable=invalid-name
+    return (type(self), (), self.__getstate__())
+  cls.__reduce__ = __reduce__
+
+
 def _Clear(self):
   # Clear fields.
   self._fields = {}
@@ -1316,6 +1310,7 @@
   _AddIsInitializedMethod(message_descriptor, cls)
   _AddMergeFromMethod(cls)
   _AddWhichOneofMethod(message_descriptor, cls)
+  _AddReduceMethod(cls)
   # Adds methods which do not depend on cls.
   cls.Clear = _Clear
   cls.DiscardUnknownFields = _DiscardUnknownFields
diff --git a/python/google/protobuf/pyext/extension_dict.cc b/python/google/protobuf/pyext/extension_dict.cc
index 9423c1d..43ee5d1 100644
--- a/python/google/protobuf/pyext/extension_dict.cc
+++ b/python/google/protobuf/pyext/extension_dict.cc
@@ -126,6 +126,8 @@
       CMessageClass* message_class = message_factory::GetOrCreateMessageClass(
           cmessage::GetFactoryForMessage(self->parent),
           descriptor->message_type());
+      ScopedPyObjectPtr message_class_handler(
+        reinterpret_cast<PyObject*>(message_class));
       if (message_class == NULL) {
         return NULL;
       }
diff --git a/python/google/protobuf/pyext/message.cc b/python/google/protobuf/pyext/message.cc
index 4f3abc8..c810b78 100644
--- a/python/google/protobuf/pyext/message.cc
+++ b/python/google/protobuf/pyext/message.cc
@@ -2342,8 +2342,10 @@
   const Message& sub_message = reflection->GetMessage(
       *self->message, field_descriptor, factory->message_factory);
 
-  CMessageClass* message_class = message_factory::GetMessageClass(
+  CMessageClass* message_class = message_factory::GetOrCreateMessageClass(
       factory, field_descriptor->message_type());
+  ScopedPyObjectPtr message_class_handler(
+      reinterpret_cast<PyObject*>(message_class));
   if (message_class == NULL) {
     return NULL;
   }
diff --git a/python/setup.py b/python/setup.py
index ef1a31b..64e318f 100755
--- a/python/setup.py
+++ b/python/setup.py
@@ -5,6 +5,7 @@
 import os
 import subprocess
 import sys
+import platform
 
 # We must use setuptools, not distutils, because we need to use the
 # namespace_packages option for the "google" package.
@@ -189,6 +190,12 @@
     if "clang" in os.popen('$CC --version 2> /dev/null').read():
       extra_compile_args.append('-Wno-shorten-64-to-32')
 
+    v, _, _ = platform.mac_ver()
+    if v:
+      v = float('.'.join(v.split('.')[:2]))
+      if v >= 10.12:
+        extra_compile_args.append('-std=c++11')
+
     if warnings_as_errors in sys.argv:
       extra_compile_args.append('-Werror')
       sys.argv.remove(warnings_as_errors)