diff --git a/cpp/ChangeLog b/cpp/ChangeLog
index e69de29b..53a99910 100644
--- a/cpp/ChangeLog
+++ b/cpp/ChangeLog
@@ -0,0 +1,10 @@
+
+2010-04-29 version 0.5.0:
+
+  * msgpack_object_type is changed. MSGPACK_OBJECT_NIL is now 0x00.
+  * New safe streaming deserializer API.
+  * Add object::object(const T&) and object::operator=(const T&)
+  * Add operator==(object, const T&)
+  * MSGPACK_DEFINE macro defines msgpack_object(object* obj, zone* z)
+  * C++ programs doesn't need to link "msgpackc" library.
+
diff --git a/cpp/configure.in b/cpp/configure.in
index 596b28d4..61fde4f7 100644
--- a/cpp/configure.in
+++ b/cpp/configure.in
@@ -1,6 +1,6 @@
 AC_INIT(object.cpp)
 AC_CONFIG_AUX_DIR(ac)
-AM_INIT_AUTOMAKE(msgpack, 0.4.3)
+AM_INIT_AUTOMAKE(msgpack, 0.5.0)
 AC_CONFIG_HEADER(config.h)
 
 AC_SUBST(CFLAGS)