diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5c4cf2a..3a65e51 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+## 4.0.0 - 2026-08-23
+
 * Dropped support for PHP <8.3.
 * Removed the deprecated `Beste\Clock` interface. Clock implementations now implement 
   `Psr\Clock\ClockInterface` directly.