diff --git a/cpp/ChangeLog b/cpp/ChangeLog
index a14807c8..a983051a 100644
--- a/cpp/ChangeLog
+++ b/cpp/ChangeLog
@@ -1,4 +1,8 @@
 
+2011-08-08 version 0.5.7:
+
+  * fixes compile error problem with llvm-gcc and Mac OS X Lion
+
 2011-04-24 version 0.5.6:
 
   * #42 fixes double-free problem on msgpack_unpacker_release_zone
diff --git a/cpp/configure.in b/cpp/configure.in
index 0cfc43ff..861d6a0a 100644
--- a/cpp/configure.in
+++ b/cpp/configure.in
@@ -1,6 +1,6 @@
 AC_INIT(src/object.cpp)
 AC_CONFIG_AUX_DIR(ac)
-AM_INIT_AUTOMAKE(msgpack, 0.5.6)
+AM_INIT_AUTOMAKE(msgpack, 0.5.7)
 AC_CONFIG_HEADER(config.h)
 
 AC_SUBST(CFLAGS)