diff --git a/CHANGES.txt b/CHANGES.txt
index 9be4173739b5..c71788c7deb5 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,3 +1,8 @@
+2021-02-05 version 3.15.1 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
+
+  Ruby
+  * Bugfix for Message.[] for repeated or map fields (#8313)
+
 2021-02-05 version 3.15.0 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
 
   Protocol Compiler
diff --git a/Protobuf-C++.podspec b/Protobuf-C++.podspec
index e794cb2a49c3..45baa3619763 100644
--- a/Protobuf-C++.podspec
+++ b/Protobuf-C++.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name     = 'Protobuf-C++'
-  s.version  = '3.15.0'
+  s.version  = '3.15.1'
   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 d982b9de8b7a..0d8206f07e72 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  = '3.15.0'
+  s.version  = '3.15.1'
   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 fed7095bbd43..f6ae5add9bd5 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],[3.15.0],[protobuf@googlegroups.com],[protobuf])
+AC_INIT([Protocol Buffers],[3.15.1],[protobuf@googlegroups.com],[protobuf])
 
 AM_MAINTAINER_MODE([enable])
 
diff --git a/csharp/Google.Protobuf.Tools.nuspec b/csharp/Google.Protobuf.Tools.nuspec
index 0e8b54d9abd1..e1cebacb276c 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>3.15.0</version>
+    <version>3.15.1</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 9c2c028507c0..cb1c983c222e 100644
--- a/csharp/src/Google.Protobuf/Google.Protobuf.csproj
+++ b/csharp/src/Google.Protobuf/Google.Protobuf.csproj
@@ -4,7 +4,7 @@
     <Description>C# runtime library for Protocol Buffers - Google's data interchange format.</Description>
     <Copyright>Copyright 2015, Google Inc.</Copyright>
     <AssemblyTitle>Google Protocol Buffers</AssemblyTitle>
-    <VersionPrefix>3.15.0</VersionPrefix>
+    <VersionPrefix>3.15.1</VersionPrefix>
     <!-- C# 7.2 is required for Span/BufferWriter/ReadOnlySequence -->
     <LangVersion>7.2</LangVersion>
     <Authors>Google Inc.</Authors>
diff --git a/java/bom/pom.xml b/java/bom/pom.xml
index 7fbd41da5ed5..46a76deec4ef 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>3.15.0</version>
+  <version>3.15.1</version>
   <packaging>pom</packaging>
 
   <name>Protocol Buffers [BOM]</name>
diff --git a/java/core/pom.xml b/java/core/pom.xml
index 79b967bb0e05..15590d53ecda 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>3.15.0</version>
+    <version>3.15.1</version>
   </parent>
 
   <artifactId>protobuf-java</artifactId>
diff --git a/java/lite/pom.xml b/java/lite/pom.xml
index fd313daf51bc..61250a6f7924 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>3.15.0</version>
+    <version>3.15.1</version>
   </parent>
 
   <artifactId>protobuf-javalite</artifactId>
diff --git a/java/pom.xml b/java/pom.xml
index 79850b17d39b..c9beebd4d735 100644
--- a/java/pom.xml
+++ b/java/pom.xml
@@ -4,7 +4,7 @@
 
   <groupId>com.google.protobuf</groupId>
   <artifactId>protobuf-parent</artifactId>
-  <version>3.15.0</version>
+  <version>3.15.1</version>
   <packaging>pom</packaging>
 
   <name>Protocol Buffers [Parent]</name>
diff --git a/java/util/pom.xml b/java/util/pom.xml
index 9c089dfb7269..0d6985dd3126 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>3.15.0</version>
+    <version>3.15.1</version>
   </parent>
 
   <artifactId>protobuf-java-util</artifactId>
diff --git a/js/package.json b/js/package.json
index 768b37a4d014..189881f7e805 100644
--- a/js/package.json
+++ b/js/package.json
@@ -1,6 +1,6 @@
 {
   "name": "google-protobuf",
-  "version": "3.15.0",
+  "version": "3.15.1",
   "description": "Protocol Buffers for JavaScript",
   "main": "google-protobuf.js",
   "files": [
diff --git a/php/ext/google/protobuf/package.xml b/php/ext/google/protobuf/package.xml
index 805c071f752c..31440b9012f7 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>2021-02-18</date>
- <time>10:33:10</time>
+ <date>2021-02-19</date>
+ <time>10:50:04</time>
  <version>
-  <release>3.15.0</release>
-  <api>3.15.0</api>
+  <release>3.15.1</release>
+  <api>3.15.1</api>
  </version>
  <stability>
   <release>stable</release>
@@ -805,5 +805,20 @@ G  A release.
    <notes>
    </notes>
   </release>
+  <release>
+   <version>
+    <release>3.15.1</release>
+    <api>3.15.1</api>
+   </version>
+   <stability>
+    <release>stable</release>
+    <api>stable</api>
+   </stability>
+   <date>2021-02-19</date>
+   <time>10:50:04</time>
+   <license uri="https://opensource.org/licenses/BSD-3-Clause">3-Clause BSD License</license>
+   <notes>
+   </notes>
+  </release>
  </changelog>
 </package>
diff --git a/php/ext/google/protobuf/protobuf.h b/php/ext/google/protobuf/protobuf.h
index 7e63ca095bcf..de783ee08beb 100644
--- a/php/ext/google/protobuf/protobuf.h
+++ b/php/ext/google/protobuf/protobuf.h
@@ -76,7 +76,7 @@ ZEND_BEGIN_ARG_INFO_EX(arginfo_setter, 0, 0, 1)
   ZEND_ARG_INFO(0, value)
 ZEND_END_ARG_INFO()
 
-#define PHP_PROTOBUF_VERSION "3.15.0"
+#define PHP_PROTOBUF_VERSION "3.15.1"
 
 // ptr -> PHP object cache. This is a weak map that caches lazily-created
 // wrapper objects around upb types:
diff --git a/protoc-artifacts/pom.xml b/protoc-artifacts/pom.xml
index cbe84bb43429..4a5ed9314571 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>3.15.0</version>
+  <version>3.15.1</version>
   <packaging>pom</packaging>
   <name>Protobuf Compiler</name>
   <description>
diff --git a/python/google/protobuf/__init__.py b/python/google/protobuf/__init__.py
index 6c20545faeff..22a6072ffd23 100644
--- a/python/google/protobuf/__init__.py
+++ b/python/google/protobuf/__init__.py
@@ -30,4 +30,4 @@
 
 # Copyright 2007 Google Inc. All Rights Reserved.
 
-__version__ = '3.15.0'
+__version__ = '3.15.1'
diff --git a/ruby/ext/google/protobuf_c/message.c b/ruby/ext/google/protobuf_c/message.c
index 22a21c129e6e..259f5e666d68 100644
--- a/ruby/ext/google/protobuf_c/message.c
+++ b/ruby/ext/google/protobuf_c/message.c
@@ -292,6 +292,35 @@ static void Message_setfield(upb_msg* msg, const upb_fielddef* f, VALUE val,
   upb_msg_set(msg, f, msgval, arena);
 }
 
+static VALUE Message_getfield(VALUE _self, const upb_fielddef* f) {
+  Message* self = ruby_to_Message(_self);
+  // This is a special-case: upb_msg_mutable() for map & array are logically
+  // const (they will not change what is serialized) but physically
+  // non-const, as they do allocate a repeated field or map. The logical
+  // constness means it's ok to do even if the message is frozen.
+  upb_msg *msg = (upb_msg*)self->msg;
+  upb_arena *arena = Arena_get(self->arena);
+  if (upb_fielddef_ismap(f)) {
+    upb_map *map = upb_msg_mutable(msg, f, arena).map;
+    const upb_fielddef *key_f = map_field_key(f);
+    const upb_fielddef *val_f = map_field_value(f);
+    upb_fieldtype_t key_type = upb_fielddef_type(key_f);
+    TypeInfo value_type_info = TypeInfo_get(val_f);
+    return Map_GetRubyWrapper(map, key_type, value_type_info, self->arena);
+  } else if (upb_fielddef_isseq(f)) {
+    upb_array *arr = upb_msg_mutable(msg, f, arena).array;
+    return RepeatedField_GetRubyWrapper(arr, TypeInfo_get(f), self->arena);
+  } else if (upb_fielddef_issubmsg(f)) {
+    if (!upb_msg_has(self->msg, f)) return Qnil;
+    upb_msg *submsg = upb_msg_mutable(msg, f, arena).msg;
+    const upb_msgdef *m = upb_fielddef_msgsubdef(f);
+    return Message_GetRubyWrapper(submsg, m, self->arena);
+  } else {
+    upb_msgval msgval = upb_msg_get(self->msg, f);
+    return Convert_UpbToRuby(msgval, TypeInfo_get(f), self->arena);
+  }
+}
+
 static VALUE Message_field_accessor(VALUE _self, const upb_fielddef* f,
                                     int accessor_type, int argc, VALUE* argv) {
   upb_arena *arena = Arena_get(Message_GetArena(_self));
@@ -350,36 +379,11 @@ static VALUE Message_field_accessor(VALUE _self, const upb_fielddef* f,
         return INT2NUM(msgval.int32_val);
       }
     }
-    case METHOD_GETTER: {
-      Message* self = ruby_to_Message(_self);
-      // This is a special-case: upb_msg_mutable() for map & array are logically
-      // const (they will not change what is serialized) but physically
-      // non-const, as they do allocate a repeated field or map. The logical
-      // constness means it's ok to do even if the message is frozen.
-      upb_msg *msg = (upb_msg*)self->msg;
-      if (upb_fielddef_ismap(f)) {
-        upb_map *map = upb_msg_mutable(msg, f, arena).map;
-        const upb_fielddef *key_f = map_field_key(f);
-        const upb_fielddef *val_f = map_field_value(f);
-        upb_fieldtype_t key_type = upb_fielddef_type(key_f);
-        TypeInfo value_type_info = TypeInfo_get(val_f);
-        return Map_GetRubyWrapper(map, key_type, value_type_info, self->arena);
-      } else if (upb_fielddef_isseq(f)) {
-        upb_array *arr = upb_msg_mutable(msg, f, arena).array;
-        return RepeatedField_GetRubyWrapper(arr, TypeInfo_get(f), self->arena);
-      } else if (upb_fielddef_issubmsg(f)) {
-        if (!upb_msg_has(self->msg, f)) return Qnil;
-        upb_msg *submsg = upb_msg_mutable(msg, f, arena).msg;
-        const upb_msgdef *m = upb_fielddef_msgsubdef(f);
-        return Message_GetRubyWrapper(submsg, m, self->arena);
-      } else {
-        upb_msgval msgval = upb_msg_get(self->msg, f);
-        return Convert_UpbToRuby(msgval, TypeInfo_get(f), self->arena);
-      }
+    case METHOD_GETTER:
+      return Message_getfield(_self, f);
     default:
       rb_raise(rb_eRuntimeError, "Internal error, no such accessor: %d",
                accessor_type);
-    }
   }
 }
 
@@ -866,7 +870,6 @@ static VALUE Message_freeze(VALUE _self) {
 static VALUE Message_index(VALUE _self, VALUE field_name) {
   Message* self = ruby_to_Message(_self);
   const upb_fielddef* field;
-  upb_msgval val;
 
   Check_Type(field_name, T_STRING);
   field = upb_msgdef_ntofz(self->msgdef, RSTRING_PTR(field_name));
@@ -875,8 +878,7 @@ static VALUE Message_index(VALUE _self, VALUE field_name) {
     return Qnil;
   }
 
-  val = upb_msg_get(self->msg, field);
-  return Convert_UpbToRuby(val, TypeInfo_get(field), self->arena);
+  return Message_getfield(_self, field);
 }
 
 /*
@@ -1285,7 +1287,7 @@ const upb_msg* Message_GetUpbMessage(VALUE value, const upb_msgdef* m,
         if (!rb_obj_is_kind_of(value, rb_cNumeric)) goto badtype;
 
         sec.int64_val = NUM2LL(value);
-        nsec.int32_val = (NUM2DBL(value) - NUM2LL(value)) * 1000000000;
+        nsec.int32_val = round((NUM2DBL(value) - NUM2LL(value)) * 1000000000);
         upb_msg_set(msg, sec_f, sec, arena);
         upb_msg_set(msg, nsec_f, nsec, arena);
         return msg;
diff --git a/ruby/google-protobuf.gemspec b/ruby/google-protobuf.gemspec
index 6420dfc0511f..eb6f794de96c 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     = "3.15.0"
+  s.version     = "3.15.1"
   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/ruby/tests/basic.rb b/ruby/tests/basic.rb
index 098ac41e7e9c..107084e66436 100755
--- a/ruby/tests/basic.rb
+++ b/ruby/tests/basic.rb
@@ -31,6 +31,33 @@ def proto_module
     end
     include CommonTests
 
+    def test_issue_8311_crash
+      Google::Protobuf::DescriptorPool.generated_pool.build do
+        add_file("inner.proto", :syntax => :proto3) do
+          add_message "Inner" do
+            # Removing either of these fixes the segfault.
+            optional :foo, :string, 1
+            optional :bar, :string, 2
+          end
+        end
+      end
+
+      Google::Protobuf::DescriptorPool.generated_pool.build do
+        add_file("outer.proto", :syntax => :proto3) do
+          add_message "Outer" do
+            repeated :inners, :message, 1, "Inner"
+          end
+        end
+      end
+
+      outer = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("Outer").msgclass
+
+      outer_proto = outer.new(
+          inners: []
+      )
+      outer_proto['inners'].to_s
+    end
+
     def test_has_field
       m = TestSingularFields.new
       assert !m.has_singular_msg?
diff --git a/ruby/tests/common_tests.rb b/ruby/tests/common_tests.rb
index 589934b0e92f..1957422fa937 100644
--- a/ruby/tests/common_tests.rb
+++ b/ruby/tests/common_tests.rb
@@ -1701,6 +1701,12 @@ def test_converts_duration
     m = proto_module::TimeMessage.new(duration: 1.1)
     assert_equal Google::Protobuf::Duration.new(seconds: 1, nanos: 100_000_000), m.duration
 
+    m = proto_module::TimeMessage.new(duration: 123.321)
+    assert_equal Google::Protobuf::Duration.new(seconds: 123, nanos: 321_000_000), m.duration
+
+    m = proto_module::TimeMessage.new(duration: -123.321)
+    assert_equal Google::Protobuf::Duration.new(seconds: -123, nanos: -321_000_000), m.duration
+
     assert_raise(Google::Protobuf::TypeError) { m.duration = '2' }
     assert_raise(Google::Protobuf::TypeError) { m.duration = proto_module::TimeMessage.new }
   end
diff --git a/src/Makefile.am b/src/Makefile.am
index 2f0f92ab98a9..c845814ebf7e 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -18,7 +18,7 @@ else
 PTHREAD_DEF =
 endif
 
-PROTOBUF_VERSION = 26:0:0
+PROTOBUF_VERSION = 26:1:0
 
 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 98d48904397f..88a0163ae66f 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 3015000 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3015001 < 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 863b9da67d10..b0958af0c219 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 3015000 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3015001 < 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 e2932deac02a..9f71b12c5147 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 3015000 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3015001 < 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 c9d47546c499..e49e9bd2ef29 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 3015000 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3015001 < 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 65c5d264a346..74b5a92611db 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 3015000 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3015001 < 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 8de6f1c0f45a..8ac8481baf6d 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 3015000 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3015001 < 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 af25a03cab03..e743efd6c433 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 3015000 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3015001 < 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 3dc0ca7f9728..6b6d34db0201 100644
--- a/src/google/protobuf/port_def.inc
+++ b/src/google/protobuf/port_def.inc
@@ -335,7 +335,7 @@
 
 // Shared google3/opensource definitions. //////////////////////////////////////
 
-#define PROTOBUF_VERSION 3015000
+#define PROTOBUF_VERSION 3015001
 #define PROTOBUF_MIN_HEADER_VERSION_FOR_PROTOC 3015000
 #define PROTOBUF_MIN_PROTOC_VERSION 3015000
 #define PROTOBUF_VERSION_SUFFIX ""
@@ -562,7 +562,9 @@
 // by this flag is supposed to be removed after this experiment.
 // #define PROTOBUF_MESSAGE_OWNED_ARENA_EXPERIMENT
 
-#if defined(__cpp_constinit)
+// Our use of constinit does not yet work with GCC:
+// https://github.com/protocolbuffers/protobuf/issues/8310
+#if defined(__cpp_constinit) && !defined(__GNUC__)
 #define PROTOBUF_CONSTINIT constinit
 #elif defined(__has_cpp_attribute)
 #if __has_cpp_attribute(clang::require_constant_initialization)
diff --git a/src/google/protobuf/source_context.pb.h b/src/google/protobuf/source_context.pb.h
index a5e9db67a980..a6a9757ac6f5 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 3015000 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3015001 < 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 ac33ab601e0a..6f2d53f31e8d 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 3015000 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3015001 < 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 c2edf7c9c5c3..a58a2843ac45 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 3015000
+#define GOOGLE_PROTOBUF_VERSION 3015001
 
 // A suffix string for alpha, beta or rc releases. Empty for stable releases.
 #define GOOGLE_PROTOBUF_VERSION_SUFFIX ""
diff --git a/src/google/protobuf/stubs/mutex.h b/src/google/protobuf/stubs/mutex.h
index 23f315f4726a..82b62a66b05e 100644
--- a/src/google/protobuf/stubs/mutex.h
+++ b/src/google/protobuf/stubs/mutex.h
@@ -126,7 +126,7 @@ class GOOGLE_PROTOBUF_CAPABILITY("mutex") PROTOBUF_EXPORT WrappedMutex {
  private:
 #if defined(GOOGLE_PROTOBUF_SUPPORT_WINDOWS_XP)
   CallOnceInitializedMutex<CriticalSectionLock> mu_{};
-#elif defined(_MSC_VER)
+#elif defined(_WIN32)
   CallOnceInitializedMutex<std::mutex> mu_{};
 #else
   std::mutex mu_{};
diff --git a/src/google/protobuf/timestamp.pb.h b/src/google/protobuf/timestamp.pb.h
index bae459137c5f..e6bf5ee48bdf 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 3015000 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3015001 < 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 7188ed36092e..8d402d8d7fc2 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 3015000 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3015001 < 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 569bde0f679f..8dbc3cb89450 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 3015000 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3015001 < 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.