diff --git a/doc/whatsnew.rst b/doc/whatsnew.rst
index b73a24e9..ecf48d77 100644
--- a/doc/whatsnew.rst
+++ b/doc/whatsnew.rst
@@ -5,8 +5,11 @@ What's new?
 
 .. _2.21.1:
 
-Next release
-============
+.. Next release
+.. ============
+
+v2.21.1 (2025-01-14)
+====================
 
 - Bug fix for writing :xml:`<str:Categorisation>` to SDMX-ML: invalid input SDMX-ML with non-standard classes tolerated in v2.21.0 (:pull:`218`) could not be round-tripped back to file (:pull:`221`).