diff --git a/CHANGELOG.md b/CHANGELOG.md
index cd1c499c..f86c49ea 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+# 2023-01-10 version 5.0.0
+  * Add additional address sanitizer for CI. (#1023)
+## << breaking changes >>
+  * Change CMake package name of C library to msgpackc (#1044)
+
 # 2021-08-01 version 4.0.0
   * Fix and improve alignment logic (#962)
   * Fix iovec name conflict (#953)
diff --git a/README.md b/README.md
index e8035965..565b9d8a 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 `msgpack` for C
 ===================
 
-Version 4.0.0 [![Build Status](https://github.com/msgpack/msgpack-c/workflows/CI/badge.svg?branch=c_master)](https://github.com/msgpack/msgpack-c/actions) [![Build status](https://ci.appveyor.com/api/projects/status/8kstcgt79qj123mw/branch/c_master?svg=true)](https://ci.appveyor.com/project/redboltz/msgpack-c/branch/c_master)
+Version 5.0.0 [![Build Status](https://github.com/msgpack/msgpack-c/workflows/CI/badge.svg?branch=c_master)](https://github.com/msgpack/msgpack-c/actions) [![Build status](https://ci.appveyor.com/api/projects/status/8kstcgt79qj123mw/branch/c_master?svg=true)](https://ci.appveyor.com/project/redboltz/msgpack-c/branch/c_master)
 [![codecov](https://codecov.io/gh/msgpack/msgpack-c/branch/c_master/graph/badge.svg)](https://codecov.io/gh/msgpack/msgpack-c/branch/c_master)
 
 It's like JSON but smaller and faster.
diff --git a/appveyor.yml b/appveyor.yml
index 36f4dd6d..599dfa81 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,4 @@
-version: 4.0.0.{build}
+version: 5.0.0.{build}
 
 branches:
   only:
diff --git a/include/msgpack/version_master.h b/include/msgpack/version_master.h
index 763c732c..5f40c467 100644
--- a/include/msgpack/version_master.h
+++ b/include/msgpack/version_master.h
@@ -1,3 +1,3 @@
-#define MSGPACK_VERSION_MAJOR    4
+#define MSGPACK_VERSION_MAJOR    5
 #define MSGPACK_VERSION_MINOR    0
 #define MSGPACK_VERSION_REVISION 0