diff --git a/CMakeLists.txt b/CMakeLists.txt
index f9a1663e..e32d301e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,9 +1,9 @@
 CMAKE_MINIMUM_REQUIRED (VERSION 2.8.6)
 PROJECT (msgpack)
 
-SET (VERSION 0.5.9)
+SET (VERSION 0.6.0)
 SET (VERSION_MAJOR 0)
-SET (VERSION_MINOR 5)
+SET (VERSION_MINOR 6)
 
 SET (prefix ${CMAKE_INSTALL_PREFIX})
 SET (exec_prefix "\${prefix}")
@@ -141,7 +141,7 @@ ADD_LIBRARY (msgpack-static STATIC
 
 SET_TARGET_PROPERTIES (msgpack-static PROPERTIES OUTPUT_NAME "msgpack")
 SET_TARGET_PROPERTIES (msgpack PROPERTIES IMPORT_SUFFIX "_import.lib")
-SET_TARGET_PROPERTIES (msgpack PROPERTIES SOVERSION 3 VERSION 3.0.0)
+SET_TARGET_PROPERTIES (msgpack PROPERTIES SOVERSION 3 VERSION 4.0.0)
 
 IF (MSGPACK_BUILD_TESTS)
 	ENABLE_TESTING ()
diff --git a/include/msgpack/version_master.h b/include/msgpack/version_master.h
index 799f4f5e..cabb9718 100644
--- a/include/msgpack/version_master.h
+++ b/include/msgpack/version_master.h
@@ -1,3 +1,3 @@
 #define MSGPACK_VERSION_MAJOR   0
-#define MSGPACK_VERSION_MINOR   5
-#define MSGPACK_VERSION_RELEASE 9
+#define MSGPACK_VERSION_MINOR   6
+#define MSGPACK_VERSION_RELEASE 0
diff --git a/src/Makefile.am b/src/Makefile.am
index 106947a7..38b0d120 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -16,7 +16,7 @@ endif
 
 
 # -version-info CURRENT:REVISION:AGE
-libmsgpack_la_LDFLAGS = -version-info 3:0:0 -no-undefined
+libmsgpack_la_LDFLAGS = -version-info 4:0:0 -no-undefined
 
 
 # backward compatibility