diff --git a/CHANGELOG.md b/CHANGELOG.md
index 400abb0..40274f7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,12 @@
 See https://common-changelog.org for commit guidelines and https://semver.org
 for versioning.
 
+## v0.4.0 - 2026-04-15
+
+### Added
+
+- Add tl_lookup_positional (#18)
+
 ## v0.3.1 - 2026-04-04
 
 ### Fixed
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0d13a25..c4dd5f8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.25)
 
-project(tinyclib VERSION 0.3.1 LANGUAGES C)
+project(tinyclib VERSION 0.4.0 LANGUAGES C)
 
 # Settings and options
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)