diff --git a/CHANGES.txt b/CHANGES.txt
index 069cd6d557..fee2a691bf 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -24,6 +24,11 @@ Unreleased Changes
     from .NET framework and old versions of mono) that do not support
     ref structs. (#7490)
 
+2020-06-01 version 3.12.3 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
+
+  Objective-C
+  * Tweak the union used for Extensions to support old generated code. #7573
+
 2020-05-26 version 3.12.2 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
 
   C++
diff --git a/Protobuf-C++.podspec b/Protobuf-C++.podspec
index 67a96cc7a0..6a51340d0f 100644
--- a/Protobuf-C++.podspec
+++ b/Protobuf-C++.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name     = 'Protobuf-C++'
-  s.version  = '3.12.2'
+  s.version  = '3.12.3'
   s.summary  = 'Protocol Buffers v3 runtime library for C++.'
   s.homepage = 'https://github.com/google/protobuf'
   s.license  = '3-Clause BSD License'
diff --git a/Protobuf.podspec b/Protobuf.podspec
index a05b712326..3b7a716761 100644
--- a/Protobuf.podspec
+++ b/Protobuf.podspec
@@ -5,7 +5,7 @@
 # dependent projects use the :git notation to refer to the library.
 Pod::Spec.new do |s|
   s.name     = 'Protobuf'
-  s.version  = '3.12.2'
+  s.version  = '3.12.3'
   s.summary  = 'Protocol Buffers v.3 runtime library for Objective-C.'
   s.homepage = 'https://github.com/protocolbuffers/protobuf'
   s.license  = '3-Clause BSD License'
diff --git a/configure.ac b/configure.ac
index e473a57914..b7c7f53068 100644
--- a/configure.ac
+++ b/configure.ac
@@ -17,7 +17,7 @@ AC_PREREQ(2.59)
 # In the SVN trunk, the version should always be the next anticipated release
 # version with the "-pre" suffix.  (We used to use "-SNAPSHOT" but this pushed
 # the size of one file name in the dist tarfile over the 99-char limit.)
-AC_INIT([Protocol Buffers],[3.12.2],[protobuf@googlegroups.com],[protobuf])
+AC_INIT([Protocol Buffers],[3.12.3],[protobuf@googlegroups.com],[protobuf])
 
 AM_MAINTAINER_MODE([enable])
 
diff --git a/csharp/Google.Protobuf.Tools.nuspec b/csharp/Google.Protobuf.Tools.nuspec
index 50aca1b506..d0c088f2a1 100644
--- a/csharp/Google.Protobuf.Tools.nuspec
+++ b/csharp/Google.Protobuf.Tools.nuspec
@@ -5,7 +5,7 @@
     <title>Google Protocol Buffers tools</title>
     <summary>Tools for Protocol Buffers - Google's data interchange format.</summary>
     <description>See project site for more info.</description>
-    <version>3.12.2</version>
+    <version>3.12.3</version>
     <authors>Google Inc.</authors>
     <owners>protobuf-packages</owners>
     <licenseUrl>https://github.com/protocolbuffers/protobuf/blob/master/LICENSE</licenseUrl>
diff --git a/csharp/src/Google.Protobuf/Google.Protobuf.csproj b/csharp/src/Google.Protobuf/Google.Protobuf.csproj
index 11615c856e..db86da520e 100644
--- a/csharp/src/Google.Protobuf/Google.Protobuf.csproj
+++ b/csharp/src/Google.Protobuf/Google.Protobuf.csproj
@@ -5,6 +5,7 @@
     <Copyright>Copyright 2015, Google Inc.</Copyright>
     <AssemblyTitle>Google Protocol Buffers</AssemblyTitle>
     <VersionPrefix>3.12.2</VersionPrefix>
+    <VersionPrefix>3.12.3</VersionPrefix>
     <!-- C# 7.2 is required for Span/BufferWriter/ReadOnlySequence -->
     <LangVersion>7.2</LangVersion>
     <Authors>Google Inc.</Authors>
diff --git a/generate_descriptor_proto.sh b/generate_descriptor_proto.sh
index e533d05b43..dc03fee019 100755
--- a/generate_descriptor_proto.sh
+++ b/generate_descriptor_proto.sh
@@ -62,7 +62,7 @@ do
     PROTOC=$BOOTSTRAP_PROTOC
     BOOTSTRAP_PROTOC=""
   else
-    make $@ protoc
+    make -j$(nproc) $@ protoc
     if test $? -ne 0; then
       echo "Failed to build protoc."
       exit 1
diff --git a/java/bom/pom.xml b/java/bom/pom.xml
index 5a63a1dc71..ff2d106764 100644
--- a/java/bom/pom.xml
+++ b/java/bom/pom.xml
@@ -4,7 +4,7 @@
 
   <groupId>com.google.protobuf</groupId>
   <artifactId>protobuf-bom</artifactId>
-  <version>3.12.2</version>
+  <version>3.12.3</version>
   <packaging>pom</packaging>
 
   <name>Protocol Buffers [BOM]</name>
diff --git a/java/core/pom.xml b/java/core/pom.xml
index 4112eb2c17..b2b0b0386e 100644
--- a/java/core/pom.xml
+++ b/java/core/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <groupId>com.google.protobuf</groupId>
     <artifactId>protobuf-parent</artifactId>
-    <version>3.12.2</version>
+    <version>3.12.3</version>
   </parent>
 
   <artifactId>protobuf-java</artifactId>
diff --git a/java/lite/pom.xml b/java/lite/pom.xml
index 30e6f37132..49686cd7ad 100644
--- a/java/lite/pom.xml
+++ b/java/lite/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <groupId>com.google.protobuf</groupId>
     <artifactId>protobuf-parent</artifactId>
-    <version>3.12.2</version>
+    <version>3.12.3</version>
   </parent>
 
   <artifactId>protobuf-javalite</artifactId>
diff --git a/java/pom.xml b/java/pom.xml
index f61c85755d..0a813e02dc 100644
--- a/java/pom.xml
+++ b/java/pom.xml
@@ -4,7 +4,7 @@
 
   <groupId>com.google.protobuf</groupId>
   <artifactId>protobuf-parent</artifactId>
-  <version>3.12.2</version>
+  <version>3.12.3</version>
   <packaging>pom</packaging>
 
   <name>Protocol Buffers [Parent]</name>
diff --git a/java/util/pom.xml b/java/util/pom.xml
index a9b8b4ab00..daa123a944 100644
--- a/java/util/pom.xml
+++ b/java/util/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <groupId>com.google.protobuf</groupId>
     <artifactId>protobuf-parent</artifactId>
-    <version>3.12.2</version>
+    <version>3.12.3</version>
   </parent>
 
   <artifactId>protobuf-java-util</artifactId>
diff --git a/js/package.json b/js/package.json
index 7fd5e69679..e4934e544c 100644
--- a/js/package.json
+++ b/js/package.json
@@ -1,6 +1,6 @@
 {
   "name": "google-protobuf",
-  "version": "3.12.2",
+  "version": "3.12.3",
   "description": "Protocol Buffers for JavaScript",
   "main": "google-protobuf.js",
   "files": [
diff --git a/objectivec/GPBDescriptor_PackagePrivate.h b/objectivec/GPBDescriptor_PackagePrivate.h
index b3d673043c..408f8d4e10 100644
--- a/objectivec/GPBDescriptor_PackagePrivate.h
+++ b/objectivec/GPBDescriptor_PackagePrivate.h
@@ -131,14 +131,29 @@ typedef NS_OPTIONS(uint8_t, GPBExtensionOptions) {
 typedef struct GPBExtensionDescription {
   GPBGenericValue defaultValue;
   const char *singletonName;
+  // Before 3.12, `extendedClass` was just a `const char *`. Thanks to nested
+  // initialization (https://en.cppreference.com/w/c/language/struct_initialization#Nested_initialization)
+  // old generated code with `.extendedClass = GPBStringifySymbol(Something)`
+  // still works; and the current generator can use `extendedClass.clazz`, to
+  // pass a Class reference.
   union {
     const char *name;
     Class clazz;
   } extendedClass;
+  // Before 3.12, this was `const char *messageOrGroupClassName`. In the
+  // initial 3.12 release, we moved the `union messageOrGroupClass`, and failed
+  // to realize that would break existing source code for extensions. So to
+  // keep existing source code working, we added an unnamed union (C11) to
+  // provide both the old field name and the new union. This keeps both older
+  // and newer code working.
+  // Background: https://github.com/protocolbuffers/protobuf/issues/7555
   union {
-    const char *name;
-    Class clazz;
-  } messageOrGroupClass;
+    const char *messageOrGroupClassName;
+    union {
+     const char *name;
+     Class clazz;
+   } messageOrGroupClass;
+  };
   GPBEnumDescriptorFunc enumDescriptorFunc;
   int32_t fieldNumber;
   GPBDataType dataType;
diff --git a/php/ext/google/protobuf/package.xml b/php/ext/google/protobuf/package.xml
index 5c9d810584..01a4b86d67 100644
--- a/php/ext/google/protobuf/package.xml
+++ b/php/ext/google/protobuf/package.xml
@@ -10,11 +10,11 @@
   <email>protobuf-opensource@google.com</email>
   <active>yes</active>
  </lead>
- <date>2020-05-26</date>
- <time>13:57:10</time>
+ <date>2020-06-01</date>
+ <time>01:14:10</time>
  <version>
-  <release>3.12.2</release>
-  <api>3.12.2</api>
+  <release>3.12.3</release>
+  <api>3.12.3</api>
  </version>
  <stability>
   <release>stable</release>
@@ -599,5 +599,19 @@ G  A release.
    <license uri="https://opensource.org/licenses/BSD-3-Clause">3-Clause BSD License</license>
    <notes>GA release.</notes>
   </release>
+  <release>
+   <version>
+    <release>3.12.3</release>
+    <api>3.12.3</api>
+   </version>
+   <stability>
+    <release>stable</release>
+    <api>stable</api>
+   </stability>
+   <date>2020-06-01</date>
+   <time>01:09:39</time>
+   <license uri="https://opensource.org/licenses/BSD-3-Clause">3-Clause BSD License</license>
+   <notes>GA release.</notes>
+  </release>
  </changelog>
 </package>
diff --git a/php/ext/google/protobuf/protobuf.h b/php/ext/google/protobuf/protobuf.h
index 090f96018c..4b8c7b15ad 100644
--- a/php/ext/google/protobuf/protobuf.h
+++ b/php/ext/google/protobuf/protobuf.h
@@ -37,7 +37,7 @@
 #include "upb.h"
 
 #define PHP_PROTOBUF_EXTNAME "protobuf"
-#define PHP_PROTOBUF_VERSION "3.12.2"
+#define PHP_PROTOBUF_VERSION "3.12.3"
 
 #define MAX_LENGTH_OF_INT64 20
 #define SIZEOF_INT64 8
diff --git a/protoc-artifacts/pom.xml b/protoc-artifacts/pom.xml
index ed028d5d4e..6d750c5b67 100644
--- a/protoc-artifacts/pom.xml
+++ b/protoc-artifacts/pom.xml
@@ -8,7 +8,7 @@
   </parent>
   <groupId>com.google.protobuf</groupId>
   <artifactId>protoc</artifactId>
-  <version>3.12.2</version>
+  <version>3.12.3</version>
   <packaging>pom</packaging>
   <name>Protobuf Compiler</name>
   <description>
diff --git a/python/google/protobuf/__init__.py b/python/google/protobuf/__init__.py
index 8b3b580922..fce24efdf6 100644
--- a/python/google/protobuf/__init__.py
+++ b/python/google/protobuf/__init__.py
@@ -30,7 +30,7 @@
 
 # Copyright 2007 Google Inc. All Rights Reserved.
 
-__version__ = '3.12.2'
+__version__ = '3.12.3'
 
 if __name__ != '__main__':
   try:
diff --git a/python/release.sh b/python/release.sh
index 8d35640e92..c915e124d8 100755
--- a/python/release.sh
+++ b/python/release.sh
@@ -80,14 +80,16 @@ python setup.py build
 python setup.py test
 
 # Deploy source package to testing PyPI
-python setup.py sdist upload -r https://test.pypi.org/legacy/
+python setup.py sdist
+twine upload --skip-existing -r testpypi -u protobuf-wheel-test dist/*
 
 # Test locally with different python versions.
 run_install_test ${TESTING_VERSION} python2.7 https://test.pypi.org/simple
 run_install_test ${TESTING_VERSION} python3 https://test.pypi.org/simple
 
 # Deploy egg/wheel packages to testing PyPI and test again.
-python setup.py bdist_egg bdist_wheel upload -r https://test.pypi.org/legacy/
+python setup.py clean build bdist_wheel
+twine upload --skip-existing -r testpypi -u protobuf-wheel-test dist/*
 
 run_install_test ${TESTING_VERSION} python2.7 https://test.pypi.org/simple
 run_install_test ${TESTING_VERSION} python3 https://test.pypi.org/simple
@@ -103,13 +105,15 @@ if [ $TESTING_ONLY -eq 0 ]; then
   echo "Publishing to PyPI..."
   # Be sure to run build before sdist, because otherwise sdist will not include
   # well-known types.
-  python setup.py clean build sdist upload
+  python setup.py clean build sdist
+  twine upload --skip-existing -u protobuf-packages dist/*
   # Be sure to run clean before bdist_xxx, because otherwise bdist_xxx will
   # include files you may not want in the package. E.g., if you have built
   # and tested with --cpp_implemenation, bdist_xxx will include the _message.so
   # file even when you no longer pass the --cpp_implemenation flag. See:
   #   https://github.com/protocolbuffers/protobuf/issues/3042
-  python setup.py clean build bdist_egg bdist_wheel upload
+  python setup.py clean build bdist_wheel
+  twine upload --skip-existing -u protobuf-packages dist/*
 else
   # Set the version number back (i.e., remove dev suffix).
   sed -i -r "s/__version__ = '.*'/__version__ = '${VERSION}'/" google/protobuf/__init__.py
diff --git a/ruby/google-protobuf.gemspec b/ruby/google-protobuf.gemspec
index 469074fe85..2160d520ab 100644
--- a/ruby/google-protobuf.gemspec
+++ b/ruby/google-protobuf.gemspec
@@ -1,6 +1,6 @@
 Gem::Specification.new do |s|
   s.name        = "google-protobuf"
-  s.version     = "3.12.2"
+  s.version     = "3.12.3"
   git_tag       = "v#{s.version.to_s.sub('.rc.', '-rc')}" # Converts X.Y.Z.rc.N to vX.Y.Z-rcN, used for the git tag
   s.licenses    = ["BSD-3-Clause"]
   s.summary     = "Protocol Buffers"
diff --git a/src/Makefile.am b/src/Makefile.am
index ffbee7055e..714fe71170 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -18,7 +18,7 @@ else
 PTHREAD_DEF =
 endif
 
-PROTOBUF_VERSION = 23:2:0
+PROTOBUF_VERSION = 23:3:0
 
 if GCC
 # Turn on all warnings except for sign comparison (we ignore sign comparison
diff --git a/src/google/protobuf/any.pb.h b/src/google/protobuf/any.pb.h
index 08913bf912..26b8ff3216 100644
--- a/src/google/protobuf/any.pb.h
+++ b/src/google/protobuf/any.pb.h
@@ -13,7 +13,7 @@
 #error incompatible with your Protocol Buffer headers. Please update
 #error your headers.
 #endif
-#if 3012002 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3012003 < PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers. Please
 #error regenerate this file with a newer version of protoc.
diff --git a/src/google/protobuf/api.pb.h b/src/google/protobuf/api.pb.h
index 3e199b635c..b416e389df 100644
--- a/src/google/protobuf/api.pb.h
+++ b/src/google/protobuf/api.pb.h
@@ -13,7 +13,7 @@
 #error incompatible with your Protocol Buffer headers. Please update
 #error your headers.
 #endif
-#if 3012002 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3012003 < PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers. Please
 #error regenerate this file with a newer version of protoc.
diff --git a/src/google/protobuf/compiler/plugin.pb.h b/src/google/protobuf/compiler/plugin.pb.h
index f4a04497b0..3a2e3c855d 100644
--- a/src/google/protobuf/compiler/plugin.pb.h
+++ b/src/google/protobuf/compiler/plugin.pb.h
@@ -13,7 +13,7 @@
 #error incompatible with your Protocol Buffer headers. Please update
 #error your headers.
 #endif
-#if 3012002 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3012003 < PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers. Please
 #error regenerate this file with a newer version of protoc.
diff --git a/src/google/protobuf/descriptor.pb.h b/src/google/protobuf/descriptor.pb.h
index fd0ed66b15..b66f530e21 100644
--- a/src/google/protobuf/descriptor.pb.h
+++ b/src/google/protobuf/descriptor.pb.h
@@ -13,7 +13,7 @@
 #error incompatible with your Protocol Buffer headers. Please update
 #error your headers.
 #endif
-#if 3012002 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3012003 < PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers. Please
 #error regenerate this file with a newer version of protoc.
diff --git a/src/google/protobuf/duration.pb.h b/src/google/protobuf/duration.pb.h
index 675cb9322e..75ba86e006 100644
--- a/src/google/protobuf/duration.pb.h
+++ b/src/google/protobuf/duration.pb.h
@@ -13,7 +13,7 @@
 #error incompatible with your Protocol Buffer headers. Please update
 #error your headers.
 #endif
-#if 3012002 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3012003 < PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers. Please
 #error regenerate this file with a newer version of protoc.
diff --git a/src/google/protobuf/empty.pb.h b/src/google/protobuf/empty.pb.h
index 232c194efd..4563aa93a0 100644
--- a/src/google/protobuf/empty.pb.h
+++ b/src/google/protobuf/empty.pb.h
@@ -13,7 +13,7 @@
 #error incompatible with your Protocol Buffer headers. Please update
 #error your headers.
 #endif
-#if 3012002 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3012003 < PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers. Please
 #error regenerate this file with a newer version of protoc.
diff --git a/src/google/protobuf/field_mask.pb.h b/src/google/protobuf/field_mask.pb.h
index b32ae3fc94..f1ccf38772 100644
--- a/src/google/protobuf/field_mask.pb.h
+++ b/src/google/protobuf/field_mask.pb.h
@@ -13,7 +13,7 @@
 #error incompatible with your Protocol Buffer headers. Please update
 #error your headers.
 #endif
-#if 3012002 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3012003 < PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers. Please
 #error regenerate this file with a newer version of protoc.
diff --git a/src/google/protobuf/port_def.inc b/src/google/protobuf/port_def.inc
index 4359bd2f48..17c3767953 100644
--- a/src/google/protobuf/port_def.inc
+++ b/src/google/protobuf/port_def.inc
@@ -300,7 +300,7 @@
 
 // Shared google3/opensource definitions. //////////////////////////////////////
 
-#define PROTOBUF_VERSION 3012002
+#define PROTOBUF_VERSION 3012003
 #define PROTOBUF_MIN_HEADER_VERSION_FOR_PROTOC 3012000
 #define PROTOBUF_MIN_PROTOC_VERSION 3012000
 #define PROTOBUF_VERSION_SUFFIX ""
diff --git a/src/google/protobuf/source_context.pb.h b/src/google/protobuf/source_context.pb.h
index c0326de5ba..e180ec2aa1 100644
--- a/src/google/protobuf/source_context.pb.h
+++ b/src/google/protobuf/source_context.pb.h
@@ -13,7 +13,7 @@
 #error incompatible with your Protocol Buffer headers. Please update
 #error your headers.
 #endif
-#if 3012002 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3012003 < PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers. Please
 #error regenerate this file with a newer version of protoc.
diff --git a/src/google/protobuf/struct.pb.h b/src/google/protobuf/struct.pb.h
index c0fdf904cc..6c86029df9 100644
--- a/src/google/protobuf/struct.pb.h
+++ b/src/google/protobuf/struct.pb.h
@@ -13,7 +13,7 @@
 #error incompatible with your Protocol Buffer headers. Please update
 #error your headers.
 #endif
-#if 3012002 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3012003 < PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers. Please
 #error regenerate this file with a newer version of protoc.
diff --git a/src/google/protobuf/stubs/common.h b/src/google/protobuf/stubs/common.h
index ca99dfd032..2270e1b946 100644
--- a/src/google/protobuf/stubs/common.h
+++ b/src/google/protobuf/stubs/common.h
@@ -82,7 +82,7 @@ namespace internal {
 
 // The current version, represented as a single integer to make comparison
 // easier:  major * 10^6 + minor * 10^3 + micro
-#define GOOGLE_PROTOBUF_VERSION 3012002
+#define GOOGLE_PROTOBUF_VERSION 3012003
 
 // A suffix string for alpha, beta or rc releases. Empty for stable releases.
 #define GOOGLE_PROTOBUF_VERSION_SUFFIX ""
diff --git a/src/google/protobuf/timestamp.pb.h b/src/google/protobuf/timestamp.pb.h
index b3db098dff..1f50194187 100644
--- a/src/google/protobuf/timestamp.pb.h
+++ b/src/google/protobuf/timestamp.pb.h
@@ -13,7 +13,7 @@
 #error incompatible with your Protocol Buffer headers. Please update
 #error your headers.
 #endif
-#if 3012002 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3012003 < PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers. Please
 #error regenerate this file with a newer version of protoc.
diff --git a/src/google/protobuf/type.pb.h b/src/google/protobuf/type.pb.h
index ea573706dd..2428722fdf 100644
--- a/src/google/protobuf/type.pb.h
+++ b/src/google/protobuf/type.pb.h
@@ -13,7 +13,7 @@
 #error incompatible with your Protocol Buffer headers. Please update
 #error your headers.
 #endif
-#if 3012002 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3012003 < PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers. Please
 #error regenerate this file with a newer version of protoc.
diff --git a/src/google/protobuf/wrappers.pb.h b/src/google/protobuf/wrappers.pb.h
index d6ee3fc662..6d354bd8bd 100644
--- a/src/google/protobuf/wrappers.pb.h
+++ b/src/google/protobuf/wrappers.pb.h
@@ -13,7 +13,7 @@
 #error incompatible with your Protocol Buffer headers. Please update
 #error your headers.
 #endif
-#if 3012002 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3012003 < PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers. Please
 #error regenerate this file with a newer version of protoc.