diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0e01d14..abfb06e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,7 +15,7 @@
 
 cmake_minimum_required(VERSION 3.20)
 
-project(BinlogServer VERSION 0.3 LANGUAGES CXX)
+project(BinlogServer VERSION 0.4 LANGUAGES CXX)
 
 # specify the C++ standard
 add_library(binlog_server_compiler_flags INTERFACE)
diff --git a/README.md b/README.md
index 3b7cbaa..443be41 100644
--- a/README.md
+++ b/README.md
@@ -182,7 +182,7 @@ For instance,
 ```
 may print
 ```
-0.3.1
+0.4.0
 ```
 
 #### 'list' operation mode
diff --git a/src/app_version.hpp b/src/app_version.hpp
index e54209b..b53144c 100644
--- a/src/app_version.hpp
+++ b/src/app_version.hpp
@@ -18,6 +18,6 @@
 
 #include "util/semantic_version.hpp"
 
-static constexpr util::semantic_version app_version{0U, 3U, 1U};
+static constexpr util::semantic_version app_version{0U, 4U, 0U};
 
 #endif // APP_VERSION_HPP