--- a/CHANGELOG	Wed Dec 31 14:58:52 2025 +0100
+++ b/CHANGELOG	Wed Dec 31 15:11:12 2025 +0100
@@ -1,4 +1,4 @@
-Version 4.0 - tbd
+Version 4.0 - 2025-12-31
 ------------------------
 
  * adds cx_system_page_size() to allocator.h