diff --git a/CMakeLists.txt b/CMakeLists.txt
index cd597ae..91a391e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,8 +1,40 @@
 cmake_minimum_required(VERSION 3.21 FATAL_ERROR)
 
+#
+# version
+#
+
+file(READ "headers/meta.hpp/meta_base/base.hpp" META_HPP_BASE_HEADER_CONTENT)
+
+set(META_HPP_VERSION_MAJOR_MATCHER "#[\t\r\n ]*define[\t\r\n ]*META_HPP_VERSION_MAJOR[\t\r\n ]*([0-9]+)")
+set(META_HPP_VERSION_MINOR_MATCHER "#[\t\r\n ]*define[\t\r\n ]*META_HPP_VERSION_MINOR[\t\r\n ]*([0-9]+)")
+set(META_HPP_VERSION_PATCH_MATCHER "#[\t\r\n ]*define[\t\r\n ]*META_HPP_VERSION_PATCH[\t\r\n ]*([0-9]+)")
+
+if(META_HPP_BASE_HEADER_CONTENT MATCHES ${META_HPP_VERSION_MAJOR_MATCHER})
+    set(META_HPP_VERSION_MAJOR ${CMAKE_MATCH_1})
+else()
+    message(FATAL_ERROR "meta.hpp: failed to resolve a major version number")
+endif()
+
+if(META_HPP_BASE_HEADER_CONTENT MATCHES ${META_HPP_VERSION_MINOR_MATCHER})
+    set(META_HPP_VERSION_MINOR ${CMAKE_MATCH_1})
+else()
+    message(FATAL_ERROR "meta.hpp: failed to resolve a minor version number")
+endif()
+
+if(META_HPP_BASE_HEADER_CONTENT MATCHES ${META_HPP_VERSION_PATCH_MATCHER})
+    set(META_HPP_VERSION_PATCH ${CMAKE_MATCH_1})
+else()
+    message(FATAL_ERROR "meta.hpp: failed to resolve a patch version number")
+endif()
+
+#
+# project
+#
+
 project(meta.hpp
-    VERSION "0.0.1"
-    DESCRIPTION "C++20 tiny dynamic reflection library"
+    VERSION "${META_HPP_VERSION_MAJOR}.${META_HPP_VERSION_MINOR}.${META_HPP_VERSION_PATCH}"
+    DESCRIPTION "C++20 Dynamic Reflection Library"
     HOMEPAGE_URL "https://github.com/blackmatov/meta.hpp"
     LANGUAGES CXX)
 
diff --git a/README.md b/README.md
index 7d81096..0adfbf5 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # meta.hpp
 
-> C++20 tiny dynamic reflection library
+> C++20 Dynamic Reflection Library
 
 [![linux][badge.linux]][linux]
 [![darwin][badge.darwin]][darwin]
diff --git a/ROADMAP.md b/ROADMAP.md
index c71737f..b775ffa 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -5,7 +5,6 @@
 - type conversions
 - non-linear search of methods/functions/...
 - register base types by `META_HPP_ENABLE_POLY_INFO`
-- add the library version to sources
 - fix all includes to work with the library more flexible
 - test and support shared libraries
 
diff --git a/develop/singles/headers/meta.hpp/meta_all.hpp b/develop/singles/headers/meta.hpp/meta_all.hpp
index b23bd24..8110722 100644
--- a/develop/singles/headers/meta.hpp/meta_all.hpp
+++ b/develop/singles/headers/meta.hpp/meta_all.hpp
@@ -38,6 +38,36 @@
 //
 //
 
+#if !defined(META_HPP_VERSION_MAJOR)
+#    define META_HPP_VERSION_MAJOR 0
+#endif
+
+#if !defined(META_HPP_VERSION_MINOR)
+#    define META_HPP_VERSION_MINOR 0
+#endif
+
+#if !defined(META_HPP_VERSION_PATCH)
+#    define META_HPP_VERSION_PATCH 1
+#endif
+
+//
+//
+//
+
+#if META_HPP_VERSION_MINOR < 0 || META_HPP_VERSION_MINOR > 99
+#    error "meta.hpp: incorrect minor version number"
+#endif
+
+#if META_HPP_VERSION_PATCH < 0 || META_HPP_VERSION_PATCH > 99
+#    error "meta.hpp: incorrect patch version number"
+#endif
+
+#define META_HPP_VERSION META_HPP_VERSION_MAJOR * 10000 + META_HPP_VERSION_MINOR * 100 + META_HPP_VERSION_PATCH
+
+//
+//
+//
+
 #if !defined(META_HPP_NO_EXCEPTIONS) && !defined(__cpp_exceptions)
 #    define META_HPP_NO_EXCEPTIONS
 #endif
@@ -58,15 +88,12 @@
 #    define META_HPP_ASSERT(...) assert(__VA_ARGS__) // NOLINT
 #endif
 
-#if defined(META_HPP_SANITIZERS)
-#    define META_HPP_DEV_ASSERT(...) META_HPP_ASSERT(__VA_ARGS__)
-#else
-#    define META_HPP_DEV_ASSERT(...) (void)0
-#endif
-
-#if !defined(META_HPP_PP_CAT)
-#    define META_HPP_PP_CAT(x, y) META_HPP_PP_CAT_I(x, y)
-#    define META_HPP_PP_CAT_I(x, y) x##y
+#if !defined(META_HPP_DEV_ASSERT)
+#    if defined(META_HPP_SANITIZERS)
+#        define META_HPP_DEV_ASSERT(...) META_HPP_ASSERT(__VA_ARGS__)
+#    else
+#        define META_HPP_DEV_ASSERT(...) (void)0
+#    endif
 #endif
 
 //
diff --git a/headers/meta.hpp/meta_base/base.hpp b/headers/meta.hpp/meta_base/base.hpp
index 7897c26..683f051 100644
--- a/headers/meta.hpp/meta_base/base.hpp
+++ b/headers/meta.hpp/meta_base/base.hpp
@@ -39,6 +39,36 @@
 //
 //
 
+#if !defined(META_HPP_VERSION_MAJOR)
+#    define META_HPP_VERSION_MAJOR 0
+#endif
+
+#if !defined(META_HPP_VERSION_MINOR)
+#    define META_HPP_VERSION_MINOR 0
+#endif
+
+#if !defined(META_HPP_VERSION_PATCH)
+#    define META_HPP_VERSION_PATCH 1
+#endif
+
+//
+//
+//
+
+#if META_HPP_VERSION_MINOR < 0 || META_HPP_VERSION_MINOR > 99
+#    error "meta.hpp: incorrect minor version number"
+#endif
+
+#if META_HPP_VERSION_PATCH < 0 || META_HPP_VERSION_PATCH > 99
+#    error "meta.hpp: incorrect patch version number"
+#endif
+
+#define META_HPP_VERSION META_HPP_VERSION_MAJOR * 10000 + META_HPP_VERSION_MINOR * 100 + META_HPP_VERSION_PATCH
+
+//
+//
+//
+
 #if !defined(META_HPP_NO_EXCEPTIONS) && !defined(__cpp_exceptions)
 #    define META_HPP_NO_EXCEPTIONS
 #endif
@@ -59,15 +89,12 @@
 #    define META_HPP_ASSERT(...) assert(__VA_ARGS__) // NOLINT
 #endif
 
-#if defined(META_HPP_SANITIZERS)
-#    define META_HPP_DEV_ASSERT(...) META_HPP_ASSERT(__VA_ARGS__)
-#else
-#    define META_HPP_DEV_ASSERT(...) (void)0
-#endif
-
-#if !defined(META_HPP_PP_CAT)
-#    define META_HPP_PP_CAT(x, y) META_HPP_PP_CAT_I(x, y)
-#    define META_HPP_PP_CAT_I(x, y) x##y
+#if !defined(META_HPP_DEV_ASSERT)
+#    if defined(META_HPP_SANITIZERS)
+#        define META_HPP_DEV_ASSERT(...) META_HPP_ASSERT(__VA_ARGS__)
+#    else
+#        define META_HPP_DEV_ASSERT(...) (void)0
+#    endif
 #endif
 
 //