diff --git a/CHANGELOG.md b/CHANGELOG.md
index 35a9134e3..2ff4ed95e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 2021-10-23 version 4.0.3 for C++
+  * Remove Enabler2 template parameter from object adaptor (#987)
+  * Add MSGPACK_BUILD_DOCS cmake option (#983, #984)
+
 # 2021-08-31 version 4.0.2 for C++
   * Fix fuzzer interface function name (#972)
   * Fix boost test link error and support both dynamin(default) and static link boost (#971)
diff --git a/README.md b/README.md
index 03ad7d749..7b750dbc0 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 `msgpack` for C++
 ===================
 
-Version 4.0.2 [![Build Status](https://github.com/msgpack/msgpack-c/workflows/CI/badge.svg?branch=cpp_master)](https://github.com/msgpack/msgpack-c/actions) [![Build status](https://ci.appveyor.com/api/projects/status/8kstcgt79qj123mw/branch/cpp_master?svg=true)](https://ci.appveyor.com/project/redboltz/msgpack-c/branch/cpp_master)
+Version 4.0.3 [![Build Status](https://github.com/msgpack/msgpack-c/workflows/CI/badge.svg?branch=cpp_master)](https://github.com/msgpack/msgpack-c/actions) [![Build status](https://ci.appveyor.com/api/projects/status/8kstcgt79qj123mw/branch/cpp_master?svg=true)](https://ci.appveyor.com/project/redboltz/msgpack-c/branch/cpp_master)
 [![codecov](https://codecov.io/gh/msgpack/msgpack-c/branch/cpp_master/graph/badge.svg)](https://codecov.io/gh/msgpack/msgpack-c/branch/cpp_master)
 
 It's like JSON but smaller and faster.
diff --git a/appveyor.yml b/appveyor.yml
index ea15d56a3..fcdef58a2 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,4 @@
-version: 4.0.2.{build}
+version: 4.0.3.{build}
 
 branches:
   only:
diff --git a/include/msgpack/version_master.hpp b/include/msgpack/version_master.hpp
index e967d3b51..9f7cd4aea 100644
--- a/include/msgpack/version_master.hpp
+++ b/include/msgpack/version_master.hpp
@@ -1,3 +1,3 @@
 #define MSGPACK_VERSION_MAJOR    4
 #define MSGPACK_VERSION_MINOR    0
-#define MSGPACK_VERSION_REVISION 2
+#define MSGPACK_VERSION_REVISION 3