diff --git a/CHANGELOG.md b/CHANGELOG.md
index cc79dfec..63bed9bd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,14 @@
+# 2020-06-05 version 3.3.0
+  * Add json example for C (#870)
+  * Add both header and body packing functions for C (#870)
+  * Set default ref_size and chunk_size to vrefbuffer (#865)
+  * Add examples (#861)
+  * Improve build system (#839, #842)
+  * Improve tests (#829)
+  * Improve documents (#828)
+  * Remove some warnings (#827, #851, #871)
+  * Improve CI environment (#824, #831, #833, #834, #846, #860, 874)
+
 # 2019-12-10 version 3.2.1
   * Fix snprintf return value checking (#821)
   * Remove some warnings (#819)
diff --git a/README.md b/README.md
index 7fb6c33d..899d6c8b 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 `msgpack` for C/C++
 ===================
 
-Version 3.2.1 [![Build Status](https://travis-ci.org/msgpack/msgpack-c.svg?branch=master)](https://travis-ci.org/msgpack/msgpack-c) [![Build status](https://ci.appveyor.com/api/projects/status/8kstcgt79qj123mw/branch/master?svg=true)](https://ci.appveyor.com/project/redboltz/msgpack-c/branch/master)
+Version 3.3.0 [![Build Status](https://travis-ci.org/msgpack/msgpack-c.svg?branch=master)](https://travis-ci.org/msgpack/msgpack-c) [![Build status](https://ci.appveyor.com/api/projects/status/8kstcgt79qj123mw/branch/master?svg=true)](https://ci.appveyor.com/project/redboltz/msgpack-c/branch/master)
 [![codecov](https://codecov.io/gh/msgpack/msgpack-c/branch/master/graph/badge.svg)](https://codecov.io/gh/msgpack/msgpack-c)
 
 It's like JSON but smaller and faster.
diff --git a/appveyor.yml b/appveyor.yml
index 29d75339..bae0fa23 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,4 @@
-version: 3.2.1.{build}
+version: 3.3.0.{build}
 
 branches:
   only:
diff --git a/include/msgpack/version_master.h b/include/msgpack/version_master.h
index 2c02e603..9db6023e 100644
--- a/include/msgpack/version_master.h
+++ b/include/msgpack/version_master.h
@@ -1,3 +1,3 @@
 #define MSGPACK_VERSION_MAJOR    3
-#define MSGPACK_VERSION_MINOR    2
-#define MSGPACK_VERSION_REVISION 1
+#define MSGPACK_VERSION_MINOR    3
+#define MSGPACK_VERSION_REVISION 0