diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5fef3ad..b435be5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.5)
 
-project(rcssmonitor VERSION 17.0.0)
+project(rcssmonitor VERSION 18.0.0)
 
 if(CMAKE_VERSION VERSION_LESS "3.7.0")
     set(CMAKE_INCLUDE_CURRENT_DIR ON)
diff --git a/ChangeLog b/ChangeLog
index 8850631..e5f6aae 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2023-03-07  Hidehisa Akiyama  <hidehisaakiyama@users.noreply.github.com>
+
+	* CMakeLists.txt:
+	* NEWS:
+	* configurea.ac:
+	- updated a major version number. Official release 18.0.0.
+
 2022-04-02  Hidehisa Akiyama  <hidehisaakiyama@users.noreply.github.com>
 
 	* CMakeLists.txt:
diff --git a/NEWS b/NEWS
index 15e925d..a9f23ae 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,11 @@
+[18.0.0]
+  * Support the changes of JSON-based protocol. To use the JSON-based
+    monitor protocol, -1 is required for client-version.
+
+  * Support the monitor protocol version 5 (RCG version 6).
+
+  * Add options to draw the selected player's focus point.
+
 [17.0.0]
   * Remove dependency on Boost library.
 
diff --git a/configure.ac b/configure.ac
index 53e9ed1..d9be792 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@
 # Process this file with autoconf to produce a configure script.
 
 AC_PREREQ(2.61)
-AC_INIT([rcssmonitor],[17.0.0],[https://github.com/rcsoccersim/rcssmonitor])
+AC_INIT([rcssmonitor],[18.0.0],[https://github.com/rcsoccersim/rcssmonitor])
 
 #LT_PREREQ(2.2.4)