diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7975fd1a..3b6204aa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,7 @@
 
 ## 4.0.0
 
-_Released 2024-xx-xx_
+_Released 2024-11-03_
 
 ### Breaking changes
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index da68041c..85a41cd3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.16)
 
 project(
         scn
-        VERSION 3.0.2
+        VERSION 4.0.0
         DESCRIPTION "scanf for modern C++"
         HOMEPAGE_URL "https://scnlib.dev"
         LANGUAGES CXX
@@ -70,7 +70,7 @@ target_link_libraries(scn PRIVATE
 )
 set_library_flags(scn)
 
-set_property(TARGET scn PROPERTY SOVERSION 3)
+set_property(TARGET scn PROPERTY SOVERSION 4)
 add_library(scn::scn ALIAS scn)
 
 add_library(scn_internal INTERFACE)
diff --git a/docs/poxy.toml b/docs/poxy.toml
index 79a0fd40..3cf95e65 100644
--- a/docs/poxy.toml
+++ b/docs/poxy.toml
@@ -36,7 +36,7 @@ strip_paths = ['../include', 'pages']
 'SCN_MOVE(x)' = 'std::move(x)'
 'SCN_FWD(x)' = 'std::forward<decltype(x)>(x)'
 'SCN_DECLVAL(x)' = 'std::declval<x>()'
-'SCN_BEGIN_NAMESPACE' = 'inline namespace v3 {'
+'SCN_BEGIN_NAMESPACE' = 'inline namespace v4 {'
 'SCN_END_NAMESPACE' = '}'
 'SCN_GCC_PUSH' = ''
 'SCN_GCC_IGNORE(...)' = ''
diff --git a/include/scn/fwd.h b/include/scn/fwd.h
index 7a999a77..e50cd985 100644
--- a/include/scn/fwd.h
+++ b/include/scn/fwd.h
@@ -24,7 +24,7 @@
 #define SCN_COMPILER(major, minor, patch) \
     ((major) * 10000000 + (minor) * 10000 + (patch))
 
-#define SCN_VERSION SCN_COMPILER(3, 0, 2)
+#define SCN_VERSION SCN_COMPILER(4, 0, 0)
 
 /////////////////////////////////////////////////////////////////
 // Library configuration