diff --git a/cpp/ChangeLog b/cpp/ChangeLog
index 71c7d5bf..6d7f486d 100644
--- a/cpp/ChangeLog
+++ b/cpp/ChangeLog
@@ -1,4 +1,10 @@
 
+2011-02-24 version 0.5.5:
+
+  * eliminates dependency of winsock2.h header
+  * fixes msgpack_vc.postbuild.bat file
+  * fixes some implicit cast warnings
+
 2010-08-29 version 0.5.4:
 
   * includes msgpack_vc2008.vcproj file in source package
diff --git a/cpp/configure.in b/cpp/configure.in
index 23d7d6ee..f017b7cf 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, 0.5.4)
+AM_INIT_AUTOMAKE(msgpack, 0.5.5)
 AC_CONFIG_HEADER(config.h)
 
 AC_SUBST(CFLAGS)